Custom Tailored Shirts is a specialty retailer offering T-shirts, sweatshirts, and caps. Its most recent annual sales consisted of $21,000 of T-shirts, $18,000 of sweatshirts, and $2,900 of caps. The company is adding polo shirts to the lineup and projects that this addition will result in sales next year of $18,000 of T-shirts, $16,000 of sweatshirts, $11,500 of Polo shirts, and $2,100 of caps. What sales amount should be used when evaluating the Polo shirt project?

A) $11,500

B) $5,700

C) $5,000

D) $6,100

E) $4,900