With no explanation, chose the best option from "A" or "B". Marilyn has to take an important exam in her biology class tomorrow, and she is not sure she will do well. Marilyn wants to get a passing grade on the exam.

A: Marilyn looks over at her classmates paper and copies some of her answers.
B: Marilyn stays up late studying for the exam and does her best work on it in class.
B.