Which of the Following Is Kant's First Formulation of the Categorical

Multiple Choice

Which of the following is Kant's first formulation of the categorical imperative?

A) Act only on that maxim by which you can at the same time will that it should become a universal law.
B) Choose the action among the possible actions open to you whereby you can most reasonably expect it to lead the best consequences for all.
C) Act virtuously.
D) Maximize pleasure and minimize pain.