The moon is more useful than the sun because the former gives us light when we really need it, while the latter gives us light during the day when we do not need it. The inference is foolish because 

Options

A. The moon has no light of its own
B. Whenever there is moon at night, it is not dark
C. It is the sun that makes the day
D. The moon is not so bright as the sun

Answer

C

Explanation

It is the sun that makes the day