In the Context of Immanuel Kant's Categorical Imperative, What Is

In the context of Immanuel Kant's categorical imperative, what is an a priori position?

A) the ability to understand the connection between the general and the particular
B) simultaneously holding two contradictory views and believing both to be true
C) a statement that one can know to be true without reference to or prior to any experience
D) the refusal, on moral grounds, to obey certain rules or laws that conflict with one's personal morality