For Most Compounds with a Single Keto Group in the Molecule

For most compounds with a single keto group in the molecule, equilibrium favors the keto form over the enol form of the compound.This is due largely to what?

A) The C=O bond is much stronger than the C=C bond.
B) The C=C bond is much stronger than the C=O bond.
C) The keto form can undergo intramolecular hydrogen bonding.
D) The enol form can undergo intramolecular hydrogen bonding.