D is the answer to this question. You should understand what a marginal benefit is in order to know why D is the answer. This is the benefit that you can get after you have received what you have already expected. You already know the rate of $15 per hour for the first 40 hours of the job. If you would go over time, you would be receiving an extra $18 per hour.
Let us say that you will just do overtime of one hour, the marginal benefit is going to be $18. The marginal benefit will not change whether you make the most of the hour that you spend working or not. This is different from marginal cost. It will help if you know the difference.
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