Which Example Illustrates How an Autocrine Signal Functions in the Human

Which example illustrates how an autocrine signal functions in the human body?

A) Blood cells secrete a factor that binds to receptors on the same blood cells, causing them to proliferate.
B) To signal hunger, cells in the stomach secrete a peptide that circulates through the blood and binds to receptors on cells in the hypothalamus in the brain.
C) In the early stages of development, a cell produces a protein on its cell surface that comes into contact with a neighboring cell, where it binds to a receptor.
D) At the junction of two nerve cells, one of the cells secretes a neurotransmitter molecule that diffuses over to the neighboring cell, where it binds and stimulates an electrochemical response.
E) At a site of skin inflammation, chemical signals are sent from blood cells to the inflamed skin cells.