The most likely true statement is:
D. On a sunny day, the air over a piece of land will be cooler than the air over a bordering lake.
This is because land heats up more quickly than water when exposed to sunlight. As a result, the air over the land will generally become warmer, while the air over the lake remains cooler due to the slower heating and cooling properties of water. This temperature difference can lead to varying air temperatures, particularly on sunny days, where the cooling effect of the lake can be significant compared to the land.