Longer Wavelengths,such as Microwaves,would Not Make a Good Basis for a Visual

Longer wavelengths,such as microwaves,would not make a good basis for a visual system because​ 

A) most longer wavelengths are blocked by the earth's atmosphere. 
B) they travel at too slow a speed. 
C) they are too abundant at the earth's surface to be useful in vision. 
D) long wavelengths penetrate objects instead of being reflected from them.