Answer:
b. adrenal medulla
Explanation:
The gland responsible for the "fight or flight" response is the adrenal medulla. The nervous system sends out an impulse to smooth muscles and glands that tell the adrenal medulla to release adrenaline and noradrenaline into the bloodstream. Once they are released into the bloodstream and  circulating through the body, it brings changes such as your breathing getting quicker and quicker and your heart pounding more and more.
