Before entering first grade, little Mina used to love to read books. Once school started, her teacher began a program to motivate her students to read. She began to give stars to those children who finished new books. As a result, Mina no longer reads while she is at home. What has likely occurred?

Mina's intrinsic motivation decreased

Explanation:

Intrinsic motivation is the motivation that emerges due to internal reward .A person gets indulged in a activity or work as it is driven by internally satisfying feeling for him/her.This feeling occurs from within individually.

According to the question,intrinsic motivation of Mina as decreased because she is not feeling satisfied by reading books at home whereas reading books at school gave her star as reward from teacher and satisfied her more.  

the answer might be either a or c. can't be too sure , because i searched the web, but no valid answers came through.

answer; ///the declaration of independence;