Correct answer is (d) Batch membrane reactor
Best explanation: The reactor presented in the diagram is batch membrane reactor. This kind of reactor has membrane tubes with an enzyme in it, which allows the substrate to diffuse in and the product to diffuse out. This reactor can be used in a semi-continuous manner which allows to use the same enzyme solution for several batches. This reactor also has heating/cooling coils and baffles in order to increase the stirring efficiency.