How could one distinguish between ketone A and enone B using IR spectroscopy? (only select one of the answer)

A B a the fingerprint regions for the 2 molecules are the most reliable in analyzing the products b the CO stretches of the epoxides are most diagnostic c ketone A should have a higher C=O stretching frequency than enone B d the CH stretches are the most diagnostic for ketone A e the C-H stretches are the most diagnostic for enone B