Why Is the Enolate of Acetone Less Basic Than the Allyl

Multiple Choice

Why is the enolate of acetone less basic than the allyl anion derived from propene?

A) Because there are more atoms in acetone
B) Because there are more resonance structures for the enolate of acetone
C) It isn't; the allyl anion is less basic.
D) One of the resonance structures for the enolate places the negative charge on the more electronegative oxygen.