If the Bajorshiks' Income Does Not Exceed the Phase-Out Level

If the Bajorshiks' income does not exceed the phase-out level of $110,000 in 2011, by how much will the child tax credit reduce their tax liability? (Assume that the child tax credit will be the same amount in 2010 as in 2011.)

A) Their tax liability will be reduced by $750.
B) Their tax liability will be reduced by $2,000.
C) Their tax liability will be reduced by $2,100.
D) Their tax liability will be reduced by $3,000.