Which Statement Best Represents the Second Law of Thermodynamics

Which statement best represents the second law of thermodynamics?

A) Heat will not flow spontaneously from a hot to a cold body.
B) Every isolated system becomes more disordered with time.
C) Scientists have constructed an engine that does nothing but convert heat to useful work.
D) The total amount of energy in the universe is constant.
E) Energy may change from one form to another over and over again.