What is the most efficient Class C IP subnet that allows for at least 67 usable host addresses?

What is the most efficient Class C IP subnet that allows for at least 67 usable host addresses?
A. 192.168.67.0 255.255.128.0
B. 172.16.100.0 255.255.255.128
C. 192.168.100.0 255.255.255.128
D. 10.100.100.0 255.255.255.128
E. 172.16.67.0 255.255.128.0
F. 10.100.67.0 255.255.128.0

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