Answer:
Option B
Step-by-step explanation:
To reciprocate means to return back or reply in same mannerism ,it came from a Latin verb meaning to move back and forth. So therefore to reciprocate means to reply back or react by to something in form of a reply. Based on my little explanation option B best fits the answer as return favours means you are paying back the person that did you a favour by also returning back yours, this best explains reciprocation.