Answer: 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.