Lisa and her 2-year-old daughter, Courtney, lived with Lisas mother all year. Lisa is 25 years old and unmarried. Her mother's AGI is $18,000. Courtney's father did not live with Lisa or her daughter and she has not signed Form 8832 (or a similar statement) to release claiming the child as a dependent to the noncustodial parent. If Lisa does not claim Courtney as a qualifying child, her mother can treat her as a qualifying child to claim certain tax benefits unless Lisa has an adjusted gross income (AGI) of what amount?

A. $5,000B. $7,500C. $10,000D. $20,000