Carlos, age $19,$ is a full$-$time graduate student at City University. During $2024,$ he received the following payments:

Cash award for being the outstanding resident adviser$ $1,500$Resident adviser housing$2,500$State scholarship for ten months $($tuition and books$)6,000$State scholarship $($meals allowance$)2,400$Loan from college financial aid office$3,000$Cash support from parents$2,000$$$17,400$

Carlos served as a resident adviser in a dormitory and, therefore, the university waived the $$2,500$ charge for the room he occupied. What is Carlos's adjusted gross income for $2024?$

a$.$ $$1,500.$

b$.$ $$9,000.$

c$.$ $$15,400.$

d$.$ $$3,900.$