Answer:
Amy's readers' club is part of her social environment that influences Amy's everyday experiences.
Step-by-step explanation:
Environment refers to the context surrounding an individual, that in which he/she develops.
Social environment refers to the immediate social context of an individual, in which he/she develops social interactions with other human beings.
In this case, Amy's readers' club, which forms part of her social interactions, influences in a way her everyday experiences and decisions. This can be seen since she checks to see what is popular before buying a new book.