FADH₂ is a product of which of the following reactions?

A) Pyruvate $\rightarrow$ Acetyl CoA
B) Malate $\rightarrow$ Oxaloacetate
C) Succinyl-CoA $\rightarrow$ Succinate
D) Succinate $\rightarrow$ Fumarate
E) Succinate $\rightarrow$ Malate