Consider This Comment from the Philosopher C

Consider this comment from the philosopher C. D. Broad regarding Kant's means-ends principle: "If we isolate a man who is a carrier of typhoid, we are treating him merely as a cause of infection to others. But, if we refuse to isolate him, we are treating other people merely as means to his comfort and culture." This example suggests that

A) our duties not to use people merely as a means can conflict, and Kant provides no counsel on how to resolve such dilemmas.
B) our duties not to use people merely as a means can sometimes be difficult to discern, but they never actually conflict.
C) our duties not to use people merely as a means are imperfect duties.
D) our duties are always clear upon further reflection.