Amy and Hobbes are married and file a joint return.Their three children are 7, 9, and 18 years old.Their modified AGI is $58,000, and their tax liability on Form 1040, line 12a is $3,647.They have no other tax credits for the tax year.What is the amount of their child tax credit/credit for other dependents on Form 1040, line 13a?

Select one:

a. $4,500

b. $6,000

c. $3,647

d. $4,000