James-Lange says we feel afraid because we notice ourselves trembling; Cannon-Bard says the trembling and the fear arise together. Cannon objected that the same bodily state accompanies fear, rage and fever. Why is that observation a problem for James-Lange?

B. Because alike bodily states would then have to feel alike.

James–Lange gives the body a specific job: not accompanying the emotion but supplying it, so the body must carry enough information to tell fear from rage, and it largely does not. Schachter and Singer's resolution keeps James's insight and answers Cannon's objection, which is often how these disputes actually end: with a third account inheriting from both.