Zoe and Jay are married and use the married fing jointly filing status. They have two children under age 10 for whom they may claim the child tax credi. Their AGi was $435,000. What amount of child tax credit may they claim on their tax return? (If necessary, the phase-out threshold for the child tax credit begins at an AGI of $400,000 for married filing jointly taxpayers and $200,000 for other taxpayers.) a. $2.250. 6.$4,000. c. $0. a. $2000