The Key Difference Between Autocrine and Paracrine Secretions Is That

The key difference between autocrine and paracrine secretions is that:

A) autocrine secretions enter the blood and act on neighbouring cells and paracrine secretions remain in the tissues and act locally.
B) paracrine secretions enter the blood and act on neighbouring cells and autocrine secretions remain in the tissues and act locally.
C) autocrine secretions have a more rapid action.
D) paracrine secretions are more potent.