MrFox Has $200,000 to Invest

Mr.Fox has $200,000 to invest.He could buy corporate bonds with a 10% before-tax yield or tax-exempt bonds with an 8% before-tax yield.Which of the following statements is false?

A) If Mr.Fox invests in the tax-exempt bonds,he will pay $4,000 implicit tax every year.
B) If Mr.Fox's marginal tax rate is 15%,he should invest in the corporate bonds.
C) If Mr.Fox's marginal tax rate is 40%,he should invest in the tax-exempt bonds.
D) None of the above is false.