The answer is A.

The Kantian ethical approach applies to the deontological theory that argues that an action is considered right or wrong depending on whether the duty has been fulfilled and not on the action's consequences. Kant believed that some actions should be prohibited even if they would bring more happiness than their alternative. According to him, one should undertake actions that respect human beings' goals rather than personal reasons. Therefore, this premise made him an opponent of the utilitarianism theory.