Saturated Fatty Acids Are Degraded by the Stepwise Reactions Of \beta

Saturated fatty acids are degraded by the stepwise reactions of $\beta$ -oxidation,producing acetyl-CoA.Under aerobic conditions,how many ATP molecules would be produced as a consequence of removal of each acetyl-CoA?

A) 2
B) 3
C) 4
D) 5
E) 6