The ______ of the act means that rule you would be following if you were to do that act.

A) morality
B) maxim
C) reasoning
D) determination

The concept being described here is that of a maxim. A maxim is a principle or rule of conduct that an individual uses to guide one's actions. Therefore, the maxim of the act refers to the rule or principle that you would be following if you were to perform that act. Morality, reasoning, and determination may all play a role in the formation of a maxim, but they are not the same thing as the maxim itself.