4) what is the main factor that contributes to carbons versatility?
a. it has an equal number of protons and neutrons
b. its outer shell electrons are evenly spaced
c. it has a four electrons in its valence shell
d. it is a very large molecule

The correct option is C)  It has a four electrons in its valence shell

Explanation:

Carbon has four electrons in its outermost shell due to which it has the ability to form single, double and even triple bonds. Carbon has the ability to form chains, branched chains and even rings due to which it is versatile in nature  and can form different types of organism compounds. Carbon is the main element in the formation of the different organic compounds due to its versatile nature. Carbon is even the element which forms many of the molecules found in space.