Arsenite dehydrogenase can block
Conversion of isocitrate to alpha- ketoglutarate
Conversion of alpha- ketoglutarate to succinyl Co-A
Conversion of malate into oxaloacetate
Conversion of pyruvate into succinyl Co-A
Arsenite dehydrogenase can block conversion of alpha- ketoglutarate to succinyl Co-A
Hence, the correct option is b.