Final answer:
The subject is psychology, and the question is about the part of the mind responsible for the decision to wait until after dinner to have a piece of cheesecake.
Step-by-step explanation:
The subject of this question is
Psychology
. The question is asking about the part of the mind that is responsible for the decision to wait until after dinner to have a piece of cheesecake.
The correct answer is Superego. The superego represents the moral and ethical standards that we internalize from society and authority figures. In this case, waiting until after dinner to have a piece of cheesecake demonstrates self-control and adherence to societal rules and expectations.