Becker CPA Review 3-11 The Tiller family has an adjusted gross income of $200,000 in 2020. The Tillers have two children, ages 12 and 13, who qualify as dependents. All of the Tillers income is from wages. What is the Tillers' child tax credit, and what portion of their child tax credit is refundable? Child Tax Credit $4,000 Refundable Portion $0 a. Ob. $4,000 $2,800 Oc. $2,000 $1,400 Od $2,000 $0