Suppose that your marginal federal income tax rate is 30%, the sum of your marginal state and local tax rates is 5%, and the yield on thirty-year U.S. Treasury bonds is 10%. You would be indifferent between buying a thirty-year Treasury bond and buying a thirty-year municipal bond issued within your state (ignoring differences in liquidity, risk, and costs of information) if the municipal bond has a yield of A) 6.5%. B) 7.0%. C) 9.5%. D) 10.0%