Answer:
C. the underlying moral rule.
Explanation:
According to kant the rightness or wrongness of actions does not depend on their consequences but on whether they fulfill our duty.
He goes on to demonstrate this further by asking these questions;
1. Can I rationally will that everyone act as I propose to act? If the answer is no, then we must not perform the action.
2. Does my action respect the goals of human beings rather than merely using them for my own purposes? Again, if the answer is no, then we must not perform the action.
His theory buttresses the fact that moral value of an action depends upon the underlying moral rule.