You Notice That the Salesperson in the Bookstore Is Wearing

You notice that the salesperson in the bookstore is wearing the same shoes as you and is in your math class. Even though another store closer to where you live also has what you are looking for, you are more likely to buy from the bookstore because you share similarities with the salesperson at the bookstore. This is an example of

A) authority.
B) scarcity.
C) social proof.
D) reciprocation.
E) liking.