The correct answer is option 1: Larger while standing than while lying.

When a human body stands on sand, the pressure exerted on the sand is larger compared to when the body is lying down. This is due to the distribution of weight over a smaller area when standing, as compared to lying down. When a person is standing, the body`s weight is concentrated on the feet which creates a higher pressure on the sand beneath the feet. In contrast, when a person is lying down, the body`s weight is distributed over a larger area, reducing the pressure on the sand.

It is important to note that the pressure exerted on sand can vary depending on factors such as body weight, body position, and the softness of the sand. However, in general, the pressure will be larger while standing compared to lying down.

Alert - correct answer should be option 2: Smaller while standing than while lying.