ANSWER
A. Thermal energy will move from a region of higher temperature to a region of lower tmperature
Step-by-step explanation
We want to determine which of the options is required by the second law of thermodynamics.
The second law of thermodynamics deals mainly with the direction of the flow of heat. It states that:
Ths implies that hno system can totally convert all heat energy it has received to work and that heat will only flow from a region of higher temperature to one of lower temperature.
Therefore, the correct option is option A.