In an organic molecule, which of the following factors would make a carbon atom the most electron-rich?
A) The carbon atom is bonded to multiple electronegative atoms, such as oxygen or chlorine.
B) The carbon atom is part of a carbonyl group (C=O).
C) The carbon atom is bonded to several alkyl groups or other carbon atoms without electronegative substituents.
D) The carbon atom is in a carboxyl group (COOH).