West Corporation has $50,000 that it plans to invest in marketable securities. The corporation is choosing between the following three equally risky securities: Alachua County tax-free municipal bonds yielding 8.50%; Exxon Mobil bonds yielding 10.50%; and GM preferred stock with a dividend yield of 9.80%. Wests corporate tax rate is 25.00%. What is the after-tax return on the best investment alternative? Assume a 70.00% dividend exclusion for tax on dividends. (Assume the company chooses on the basis of after-tax returns. Round your final answer to 3 decimal places.)

A. 8.159%

B. 6.799%

C. 7.161%

D. 8.575%

E.7.887%