12 A heat engine operates between 200K and 100K. In each cycle it takes 100J from the hot reservoir, loses 25J to the cold reservoir and does 75J of work. This heat engine violates:
(A)both the first and second laws of thermodynamics
(B)the first law but not the second law
(C)the second law but not the first law
(D)neither the first law nor the second law
(E)cannot answer without knowing the mechanical equivalent of heat