Roy and Monica are married and will file a joint return. They have a daughter, Rachel, age 5. While Roy works and Monica looks for work, Rachel stays at Wee Care. Monica is not disabled. In 2011, they paid $1,500 for child care. Roys earned income was $24,000 and Monica had no earned income. What is the amount of their child and dependent care credit?

A) $1,500

B) $0

C) $450

Accodiding to the answer key,the right answer is B. Please explain why?