Which Is Not an Assumption and Principle of Kantian Ethics

Which is not an assumption and principle of Kantian ethics?

A) Humans are autonomous beings capable of understanding the world around them.
B) Morality cannot be solely a produce of feelings because if it were, morality would vary from individual to individual.
C) Individuals should use rules for their moral decision-making that are justified by their consequences.
D) Fundamental principle of morality is the moral law, the categorical imperative.