Of the Carbonyl Compounds; (1) Benzaldehyde, (2) Acetophenone and (3) $\alpha$

Of the carbonyl compounds; (1) benzaldehyde, (2) acetophenone and (3) dicyclohexyl ketone, which compound has no $\alpha$ -hydrogens?

A) benzaldehyde
B) acetophenone
C) acetone
D) All of these compounds contain $\alpha$ -hydrogens