Question

rules help things run smoothly. for example, some classrooms have a rule that only one person talks at a time. this way, everyone can hear what is being said.
another reason for rules is fairness. libraries have a rule that when you borrow a book, you have to return it by a certain date. otherwise, you might have to pay a library fine. after all, other people deserve the chance to read the book, too! this rule keeps things fair.
why do libraries have a rule about the length of time that books can be borrowed?
choose one option
a to keep everyone safe
b to keep things fair
c to make sure everyone can hear the librarian

Explanation:

The text states that library book return rules exist so other people get a chance to read the books, which keeps things fair. This matches option B, while options A and C are unrelated to the stated reason.

Answer:

B. To keep things fair