Answer:
giving a friend a birthday present after they have given you one
Explanation:
<em>Reciprocity</em> means the generosity flows both ways.
<em>Between peers</em> means the participants have the same general characteristic age, education, experience, and so on. <em>Friends</em> are often peers.
The correct answer among the choices given is option A. Athletes can end up anemic, injured, and chronically sick with colds or the flu if they neglect their protein needs. Athletes require the essential nutrients and minerals the body needs. Studies also has showed that athletes needs more protein in their diet due to their intense training.
