Franz Mesmer's Theory of Animal Magnetism Made Sense in the Late

Franz Mesmer's theory of animal magnetism made sense in the late eighteenth century because

A) animals were found to have magnetic currents flowing through their bodies.
B) a number of other invisible forces in nature were identified at this time.
C) it had been conclusively shown that animals could be hypnotized.
D) the use of magnets to redirect the body's natural energy was a popular medical treatment.