| What statement represents the second law of thermodynamics? |
| A) When heat is transferred from one body to another, the direction of heat flow is unidirectional from the relatively cold body to the relatively hot body. |
| B) When heat is transferred from one body to another, the direction of heat flow between the two bodies is unpredictable. |
| C) When heat is transferred from one body to another, the direction of heat flow is unidirectional from the relatively hot body to the relatively cold body. |
| D) When heat is transferred from one body to another, the direction of heat flow is bidirectional from the relatively hot body to the relatively cold body and from the relatively cold body to the relatively hot body. |
