In order to determine the direction of heat flow between the two blocks, we need to consider their temperatures. Heat always flows from the hotter object to the cooler object until thermal equilibrium is reached.
If Block A is at a higher temperature than Block B, heat will flow from Block A to Block B. Conversely, if Block B is at a higher temperature than Block A, heat will flow from Block B to Block A.
Since I don’t have the specific temperatures of Block A and Block B or the diagrams available, you should select the diagram that indicates heat flowing from the hotter block to the cooler block. Look for an illustration that shows arrows indicating heat movement from the block with the higher temperature to the block with the lower temperature.
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