The Defence of 'Diminished Responsibility' Is the Assertion by a Criminal

The defence of 'diminished responsibility' is the assertion by a criminal defendant that:

A) The application of force was in self-defence and the force used was reasonable and not excessive.
B) Mental illness meant that the defendant was unable to form the requisite criminal intent.
C) At the time of carrying out the criminal act the defendant suffered from an abnormality of mind that impaired their understanding of right and wrong.
D) At the time of committing the crime the defendant's will was overpowered by compulsion or by the will of another.