Which statement is true about the skin?

The second option is the answer.

Explanation:

The epidermis is a multi-stratified epithelium, that is, formed by several layers (strata) of juxtaposed cells. The innermost epidermal layer is called the germ layer, and is formed by cells that continually multiply, so that the newly generated cells push the older cells upward toward the surface of the body. As they age, the epidermal cells become flattened and manufacture and accumulate within themselves a resistant protein, keratin.

The most superficial cells, when they become full of keratin, die and constitute a friction resistant coating and highly impermeable to water loss.

when you rub, you also apply pressure, that pressure can urge the poop to come out. i think that when your rubbing, you also might be slightly breaking it up and that can further fill the stomach.