Which Reason Is MOST Probable for Why Carbon Is Used

Multiple Choice

Which reason is MOST probable for why carbon is used in living organisms but not silicon?

A) Carbon can make four bonds, whereas silicon can only make three.
B) Carbon can make double bonds, but silicon cannot.
C) Carbon can form more preferred geometries when bonding.
D) Carbon is lighter, and therefore its bonds are stronger.
E) Silicon is heavier, and therefore its bonds are stronger.