XYZ Corp. has equity beta 1.8 and market value of equity $230 million. The required return on XYZ's debt is 6.8%. The maket value of that debt is $250 million and the book value is $240 million. The risk-free rate is 4% and the expected return on the market is 9.9%; the tax rate of this company is 40%. What is XYZ's WACC ?

a. 8.68

b. 9.14

c.10.30

d. 7.98