Answer: enough to earn some money but not too much to jeopardize your grade
Step-by-step explanation:
Based on the scenario explained in the question, the student will earn enough to earn some money but not too much to jeopardize his or her grade.
Option A is incorrect as working for enough hours to get the money to pay for school means that the grades will be jeopardized as there won't be time to study or attend classes.
Option B is incorrect because working as much as the boss demands will have a negative effect on grades. Option C is incorrect as well.
The correct option is D.