When a child touches a hot surface, receptors in the hand send a signal to the nervous system. The nervous system then sends a signal to the muscles in the arm to contract and move the hand from the hot surface.

This example of how

A.cells in the body work independently of each other and have no need to coordinate or communicate.

B.a behavioral response triggered by an internal stimulus does not require communication between cells.

C.an internal stimulus does not require the communication between different parts of the body.

D.a behavioral response requires coordination and communication between different parts of the body.