What theory suggests that we end up choosing someone who is close to our own level of attractiveness?

matching hypothesis

Explanation:

Matching hypothesis -

It is a psychological social psychology theory , which was given in 1966 by Walster.

According to this theory , people are always in search of similarity , i.e. , people get along with the people with same nature , physical appearance , similar likes and dislikes , as they think they are more comfortable with people of similar type .

Hence, while choosing relationship partner or life partner , the person tries to find the one with similar characteristics .

Hence, the correct term for the given statement is matching hypothesis.  

to fit in with the new circle of friends that looks like to accept him, elias realized that he needs to abandon being an excellent student at his old school. elias does this because of conformity, that’s why he put forth little effort in his school work at his new school,