Ron,age 19,is a Full-Time Graduate Student at City University

Ron,age 19,is a full-time graduate student at City University.During 2017,he received the following payments:
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Ron served as a resident adviser in a dormitory and,therefore,the university waived the $2,500 charge for the room he occupied.What is Ron's adjusted gross income for 2017?

A) $1,500.
B) $3,900.
C) $9,000.
D) $15,400.
E) None of these.