Robert Has Assaulted a Neighbor

Multiple Choice

Robert has assaulted a neighbor. Even though he understands the act itself, he is declared, according to the M'Naghten standard, to be insane. Which of the following would most effectively help us judge the accuracy of this claim?

A) Robert is unable to give a detailed account of his actions at the time of the offense.
B) Robert had been heavily intoxicated at the time of the offense.
C) Robert had a long history of mental illness during his childhood.
D) It has been determined that at the time of his offense, Robert was suffering from a defect of the mind.
E) Robert is unable to understand that the act is wrong.