How Do Instrumental Marxists Define the Purpose of "Criminology

How do instrumental Marxists define the purpose of "criminology"?

A) decriminalizing sexism, racism, and hate crimes
B) educating the poor and lower classes on the letter of the law so as to avoid detection and prosecution
C) unmasking the true purpose of the law by showing how it works to preserve the ruling-class's power
D) educating the poor, inmates, and indigents on legal criminal defences