Eric and Mark were at a ball game and visited the concession stand. They each got a hamburger, and Mark got a lemonade and some cotton candy. Eric had a coupon for $2 off the cost. Mark paid the rest, which came to $14.50. Cotton candy costs $5, and a hamburger costs $4. How much is lemonade?
A. $7.50
B. $1.50
C. $4.00
D. $3.50