Charlie's Chimps Is a Perfectly Competitive Firm That Produces Cuddly

Charlie's Chimps is a perfectly competitive firm that produces cuddly chimps for children. The market price of a chimp is $10, and Charlie's produces 100 chimps. The marginal cost of the 100th chimp is $9. Charlie's ________.

A) is maximizing its profit
B) will maximize its profit if it produces more than 100 chimps
C) will maximize its profit if it lowers the price to $9 a chimp
D) will maximize its profit if it produces fewer than 100 chimps