Consider this comment from the philosopher C$.$ D$.$ Broad regarding Kant's meansends

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.