Given a Nominal Interest Rate of 12 Percent,in Which of the Following

Given a nominal interest rate of 12 percent,in which of the following cases would you earn the highest after-tax real interest rate?

A) Inflation is 5 percent, and the tax rate is 20 percent.
B) Inflation is 4 percent, and the tax rate is 30 percent.
C) Inflation is 3 percent, and the tax rate is 40 percent.
D) Inflation is 2 percent, and the tax rate is 50 percent.