Why would taking cover in the shadows beneath a rock overhang be preferred over building a shelter in the desert?

The choice of taking cover in the shadows beneath a rock overhang is preferred over building a shelter in the desert primarily because it utilizes the natural environment for shelter while minimizing fluid loss through sweating. In desert conditions, temperatures can soar during the day, leading to the risk of dehydration due to excessive sweating.

Using a rock overhang allows individuals to take advantage of the shade that significantly reduces direct sunlight exposure. This natural cover often maintains a cooler microclimate, helping to regulate body temperature and minimize the need for sweating, which is the body's method of cooling itself. In addition, it reduces the effort and resource requirements associated with constructing a makeshift shelter, allowing individuals to conserve energy and fluids that are crucial in survival situations.

Meanwhile, the other options do not fully capture the practical benefits of finding natural shelter in a desert environment. While comfort, heat retention, and the difficulty of building a shelter might be relevant considerations, they do not address the immediate concern of minimizing fluid loss or conserving energy and resources in a harsh climate.