The correct answer is B. Sole.
The skin on the soles of our feet is the thickest skin on our body. It is about 4-5 times thicker than the skin on our palms. The thick skin on our soles helps to protect our feet from the wear and tear of walking and standing.
The skin on our palms is also relatively thick, but it is not as thick as the skin on our soles. The skin on our palms is about 2-3 times thicker than the skin on other parts of our body. The thick skin on our palms helps to protect our hands from the wear and tear of gripping and manipulating objects.
The skin on our neck is thinner than the skin on our palms and soles. The skin on our neck is about 1-2 times thicker than the skin on other parts of our body. The thin skin on our neck is more susceptible to damage from the sun and other environmental factors.
The skin on our head is the thinnest skin on our body. The skin on our head is about 0.5-1 times thicker than the skin on other parts of our body. The thin skin on our head is more susceptible to damage from the sun and other environmental factors.