In Which of the Following Citric Acid Cycle Reactions Does $\rightarrow$

In which of the following citric acid cycle reactions does the coenzyme FAD participate?

A) citrate $\rightarrow$ isocitrate
B) succinate $\rightarrow$ fumarate
C) malate $\rightarrow$ oxaloacetate
D) more than one correct response
E) no correct response