The Demand for Professor Bongmore's New Book Is Given by the Function

The demand for Professor Bongmore's new book is given by the function Q = 2,000 - 100p.If the cost of having the book typeset is $7,000, if the marginal cost of printing an extra copy is $4, and if he has no other costs, 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.