Paul and Maggie are married and want to file a joint return. Maggie is a U.S. citizen and has a valid Social Security number. Paul is a resident alien and has an ITIN. They resided in the United States all year with their children. Paul and Maggie have two children, Cheryl, age 4, and Mike, age 15. Cheryl and Mike are U.S. citizens and have valid Social Security numbers. Paul earned $18,000 in wages. Maggie earned $20,000 in wages. In order to work, the Thomas's paid child and dependent care expenses of $3,500 for their daughter Cheryl to attend Busy Bee Child Care. Paul and Maggie provided all of the support for their two children. Paul and Maggie declined to receive advance payments for the Child Tax Credit. What is the maximum amount Paul and Maggie are eligible to claim for the child tax credit? OA. $3,000 OB. $3,600 OC. $6,000 OD. $6,600