A Book Vendor Can Produce a Book at a Constant

Multiple Choice

A book vendor can produce a book at a constant MC equal to zero, and its potential buyers have the following reservation prices: $55, $50, $45, $40, $35, $30, $25, $20, $15, $10, $5. Suppose the book vendor can identify each buyer's reservation price and is able to set an individual price for each buyer. In order to maximize profits, the monopolist will sell:

A) 12 books.
B) 10 books.
C) 11 books.
D) 8 books.