The next step is our last step of citric acid cycle. This is the regeneration of Oxaloacetate. Pick the correct corresponding reaction to complete our cycle.
Malate + H2O --> Oxaloacetate (Hydration Reaction)
Malate + FAD --> Oxaloacetate + FADH2 (Oxidation reaction)
Malate + Acetyl CoA --> Oxaloacetate + CoA-SH (Condensation reaction)
Malate + NAD+ --> Oxaloacetate + NADH + H+ (Oxidation reaction)