THE POWER OF ‘LIKE’ commonlit: which statement best express the central idea of the text?

A. Looking through photos and posts on social media decreases activity in the brain as it is a mindless task.
B. People are more likely to feel jealousy towards other people's photos and likes than they are to feel rewarded for their own posts.
C. Posting and receiving likes on social media posts an easy way to improve a person's mood by activating the brain's reward system.
D. The pictures that people post and the likes that they receive have the power to influence the actions of the people who see them.