Cindy was awarded a $6,000 scholarship to attend the state university. She spent $4,000 for tuition, $500 for required textbooks, and $1,500 for room and board. She works part-time on campus earning $5,000, which covers the balance of her room and board and other expenses. How much must Cindy include in her gross income?
a. $0
b. $5,000
c. $6,500
d. $7,000