MsKilo's Regular Income Tax Before Credits on Her Form 1040

Ms.Kilo's regular income tax before credits on her Form 1040 is $45,890,and she has a $5,700 minimum tax credit from a previous year.Which of the following statements is true?

A) If Ms.Kilo's tentative minimum tax is $50,500,her total tax liability is $44,800.
B) If Ms.Kilo's tentative minimum tax is $42,400,her total tax liability is $40,190.
C) If Ms.Kilo's tentative minimum tax is $42,400,her total tax liability is $42,400.
D) Both A.and C.are true.