The suggested answer is correct in its approach to calculating the usable host ranges, and the provided reasoning is generally sound. I agree with the suggested answer, but will elaborate further to ensure clarity and provide comprehensive reasoning, including addressing the concern about the provided IP addresses on the left side.

Here's a breakdown of how to determine the correct matches and why:

Understanding Subnetting: Subnetting involves dividing a larger network into smaller, more manageable networks. Key concepts include:
- Network Address: The first address in a subnet, identifying the network itself.
- Broadcast Address: The last address in a subnet, used to send messages to all devices on that subnet.
- Usable Host Range: The range of IP addresses between the network address and the broadcast address that can be assigned to devices.
- Subnet Mask: Determines the size of the subnet. A /18 mask means the first 18 bits of the IP address represent the network, while the remaining bits represent hosts.
Calculating Usable Host Ranges:
1. Determine the Network Address: Use the subnet mask to find the network address. This involves performing a bitwise AND operation between the IP address and the subnet mask. A faster way, as described in the suggested answer, is to determine the increment and find the greatest multiple of the increment that's not greater than the octet value.
2. Determine the Broadcast Address: Find the next network address and subtract 1.
3. Determine the Usable Host Range: The usable host range starts one IP address after the network address and ends one IP address before the broadcast address.
Matching the Subnets to Host Ranges (with detailed calculations):
Note that in the problem statement, the "IPv4 network subnets" on the left-hand side are actually IP addresses *within* those subnets. This is what makes the question a bit tricky.
We will determine the *actual* subnets and then find the usable host ranges.
- 172.28.228.144/18:
  Increment: 64 (256 - 192, where 192 comes from the 18-bit subnet mask: 11111111.11111111.11000000.00000000)
  Network Address: 172.28.192.0 (because 64 * 3 = 192 is the largest multiple of 64 less than 228, applied to the third octet)
  Broadcast Address: 172.28.255.255 (Next network is 172.28.256.0, subtract 1)
  Usable Host Range: 172.28.192.1 - 172.28.255.254
  Matches: 172.28.192.1 - 172.28.255.254
- 172.28.228.144/20:
  Increment: 16 (256 - 240, where 240 comes from the 20-bit subnet mask: 11111111.11111111.11110000.00000000)
  Network Address: 172.28.224.0 (because 16 * 14 = 224 is the largest multiple of 16 less than 228)
  Broadcast Address: 172.28.239.255 (Next network is 172.28.240.0, subtract 1)
  Usable Host Range: 172.28.224.1 - 172.28.239.254
  Matches: 172.28.224.1 - 172.28.239.254
- 172.28.228.144/23:
  Increment: 2 (256 - 254 = 2, where 254 comes from 11111111.11111111.11111110.00000000)
  Network Address: 172.28.228.0 (because 228 is a multiple of 2)
  Broadcast Address: 172.28.229.255 (Next network is 172.28.230.0, subtract 1)
  Usable Host Range: 172.28.228.1 - 172.28.229.254
  Matches: 172.28.228.1 - 172.28.229.254
- 172.28.228.144/26:
  Increment: 64 (256 - 192 = 64 in the fourth octet, where 192 comes from 11111111.11111111.11111111.11000000)
  Network Address: 172.28.228.128 (because 64 * 2 = 128 is the largest multiple of 64 less than 144)
  Broadcast Address: 172.28.228.191 (Next network is 172.28.228.192, subtract 1)
  Usable Host Range: 172.28.228.129 - 172.28.228.190
  Matches: 172.28.228.129 - 172.28.228.190
Why the other options are incorrect: The other options do not align with the correct calculations of network addresses, broadcast addresses, and subsequently, the usable host ranges for the given subnet masks. Calculating these values accurately is crucial for correct subnetting.
For example, if we were to incorrectly calculate the network address for 172.28.228.144/20, the entire range would be shifted, leading to a mismatch.

Therefore, by following the steps to correctly determine the network address, broadcast address, and usable host range for each subnet, we can accurately match each IPv4 network subnet to its corresponding usable host range.

Cisco Network Associate (CCNA, 200-301)