In Problem 1, If the Demand Schedule for Bong's Book

In Problem 1, if the demand schedule for Bong's book is Q = 2,000 - 100p, the cost of having the book typeset is $9,000, and the marginal cost of printing an extra book is $4, then he would maximize his profits by

A) having it typeset and selling 800 copies.
B) having it typeset and selling 1,000 copies.
C) not having it typeset and not selling any copies.
D) having it typeset and selling 1,600 copies.
E) having it typeset and selling 400 copies.