The correct answer is C. Sand on the shore because it has a relatively low specific heat.
Step-by-step explanation
Specific heat capacity is a physical quantity that establishes the amount of heat that a substance requires to raise its temperature by one unit. For example, sand has a heat capacity of 830 (J / Kg C °), which means that sand does not require much temperature to increase its temperature, while other substances such as air or seawater have a higher specific heat capacity. According to the above, the substance that can be heated the most during a sunny day is sand because it has a lower specific heat capacity than air, seawater, and freshwater.