Answer:
the answer is second option
ESTROUS CYCLE
Explanation:
A virus is a small infectious agent that replicates only inside the living cells of other organisms. Viruses can infect all types of life forms, from animals and plants to microorganisms, including bacteria and archaea.
Norepinephrine, Adrenaline and Cortisol are the major ones that are released
Hmm well, it's hard to choose. But I would choose A because I know that social rejection is a cause of some depression.
-hope this helps :3