What Property of Carbon Allows for the Formation of So

What property of carbon allows for the formation of so many different organic molecules?

A) Carbon forms three different isotopes which allows for the formation of many more molecules than other elements.
B) Carbon atoms are unique in their ability to form strong chemical bonds repeatedly with other carbon atoms,which permits the formation of countless possible structures.
C) Carbon atoms uniquely contain exactly the same number (six) of protons,neutrons and electrons in their atomic structure.
D) Carbon resides in the exact middle of the periodic table,from left to right,with exactly the same number of reactive elements on either side of it.It can therefore react with the maximum number of elements.