Which of the following is least critical for explaining why carbon is the basis of many different organic molecules?

A)A carbon atom has an atomic weight of 12.
B)Carbon can form double bonds with itself or other atoms.
C)A carbon atom can form covalent bonds with four different reactive atoms.
D)A string of carbons can form a ring compound or a branching structure.
E)Carbon can form covalent bonds with other carbons,which can lead to long chain of carbons.