Which statement regarding the second law of thermodynamics is true?

a.
heat can transfer from a cold to a hot body without converting a certain amount of work to heat energy.

b.
heat cannot transfer from a hot to a cold body without converting a certain amount of work to heat energy.

c.
heat cannot transfer from a cold to a hot body without converting a certain amount of work to heat energy.

d.
heat cannot transfer from a cold to a hot body without transferring mass first.