Answer:
Child Tax Credit is given to taxpayers for each qualifying dependent child who is below 17 years old at the end of the tax year. The Child Tax Credit amount is $2000 per qualifying dependent. So here, Jennifer has two qualifying dependent child Sydney and Patrick who are under 17 before the end of the tax year. JoAnna does not qualifies for Child Tax Credit as her age is above 17 years for the tax year. So the total Child Tax Credit amount to Jennifer is $4000.
Option 4 is correct.