**Magoosh**

To graduate, John needs to complete eight courses. Of these eight, he must take only three science courses, only two math courses, and only one history course. If the college offers five science courses, six math courses, and four history courses, how many different class schedules can John have if the college offers a total of twenty courses?

A. 150

B. 600

C. 3000

D. 6000

E. 12450

OA D