Answer:
B. Irresistible impulse.
Explanation:
Irresistible impulse is the most appropriate legal test of sanity related to the act because the defendant admits that what he did was wrong, but he still did it due to his schizophrenic illness. If it can be proven that the defendant killed the person due to an irresistible impulse caused by his schizophrenia, he will not be guilty.