Final answer:
Kant believed that all one's duties are derived from The categorical imperative, which represents universal principles that can be deduced through reason and apply to all rational beings.
Step-by-step explanation:
According to Immanuel Kant, all one's duties can be derived from c) The categorical imperative. Kant proposed that moral actions are not rooted in human desires or consequential outcomes, but rather in moral laws that rational beings can deduce through reason. He formulated the categorical imperative as a set of universal principles, directing individuals to act only on maxims that one would desire to become universal laws.
Kant also introduced the notion of perfect and imperfect duties, where perfect duties are those that we are obligated to follow under any circumstances, such as the duty not to lie. Kant developed his ethical framework as part of his deontological approach.