During the First Step of the Citric Acid Cycle,energy Stored $\rightarrow$

During the first step of the citric acid cycle,energy stored in acetyl CoA is used to

A) create a proton gradient.
B) drive the reaction ADP + P_i $\rightarrow$ ATP.
C) reduce NAD⁺ to NADH.
D) drive the reaction oxaloacetate $\rightarrow$ citric acid.
E) reduce FAD to FADH₂.