Aserious criticism of kant's theory is that:

a. his theory relies too much on utilitarianism.

b. his theory is too specific about how to state a rule describing an action.

c. his theory is not subjective enough.

d. his theory allows too much subjectivity in moral decision making.

The correct answer is B.his theory is too specific about how to state a rule describing an action.

Kant was highly criticized for his theory in which most of the times there is no single rule that fully characterizes an action. That was one of the most important critics that he had for his work.