Ms Kilo's Regular Income Tax Before Credits on Her Form

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.