The Nervous System is the power source of your body. Using electrical impulses, your nervous system helps control your muscle movements. The two main functions are the Sensory(afferent) division- which brings information to your brain. Then your Motor(efferent) division- which sends signals out.
I believe it is A, I’m torn between A and D but I’m not sure.
A) causes an effector to signal the control center of an organism, which creates the stimulus to make a response