Which of the Following Reactions Involves a Substrate Level Phosphorylation $\rightarrow$

Which of the following reactions involves a substrate level phosphorylation?

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