Rachel died in 2017 and her executor is finalizing her estate tax return. The executor has determined that Rachel's adjusted gross estate is $6,150,000 and that her estate is entitled to a charitable deduction in the amount of $500,000. Calculate the estate tax liability, in 2017, for Rachel's estate.

A) $64,000

B) $500,000

C) $1,750,000

D) $2,205,800