Which subnet mask would be assigned to the network address of 192.168.32.0 to provide 254 useable host addresses per subnetwork?

A /24 subnet mask (255.255.255.0) provides 256 total IP addresses, with 254 usable for hosts after subtracting the network address and broadcast address. The network address 192.168.32.0 with this mask gives the range 192.168.32.1 to 192.168.32.254 for host assignment. Option A (/16) would provide 65,534 hosts, which is excessive. Option C (/23) would give 510 hosts, and Option D (/21) would provide 2,046 hosts - both far more than needed.