If two objects are in thermal contact and one object is at a higher temperature than the other, then
A.
heat will flow from the cooler object to the warmer object, increasing the temperature difference between them.

B.
cold will flow from the cooler object to the warmer object until they reach the same temperature.

C.
cold will flow from the warmer object to the cooler object, increasing the temperature difference between them.

D.
heat will flow from the warmer object to the cooler object until they reach the same temperature.