Which of the following are Kant’s postulates of morality?
A. Freedom of the will
B. Immortality of the soul
C. The existence of God
D. Kingdom of Ends
Choose the correct answer from the options given below:

Correct option is B

Correct answer: b A, B and C only
​Introduction: ​Kant's postulates of practical reason are necessary metaphysical presuppositions that are not provable by theoretical reason but must be assumed to make moral action and the pursuit of the highest good coherent.
​Information Booster: · ​ Freedom of the Will (A): For moral responsibility to exist, the human agent must be free. If our actions were completely determined by natural laws, moral obligations ("oughts") would be meaningless, establishing the postulate "ought implies can" .
· ​ Immortality of the Soul (B): The moral law demands perfect conformity of the will with the law (holiness). Since finite human beings cannot achieve this perfection in a limited lifetime, Kant argued we must assume an endless progress toward this ideal, which requires the immortality of the soul.
· ​ The Existence of God (C): Kant argued that the highest good ( Summum Bonum) requires a perfect alignment of morality with happiness. Since nature alone cannot guarantee that the virtuous are rewarded with happiness, we must postulate an all-powerful, moral governor of the universe (God) to secure this harmony.
​Additional Knowledge: · ​ Kingdom of Ends (D):
· ​The Kingdom of Ends is not a postulate of practical reason. Instead, it is a key systematic formulation of Kant's Categorical Imperative. It serves as a moral framework and ideal community where all rational beings are treated as ends in themselves rather than mere means, rather than a metaphysical assumption required to make moral action logical.