i don't understand c question and answer.

cost of capital is same as wacc??

13. SML and WACC An all-equity firm is considering the following projects PROJECT BETA IRR w X .75 .90 1.15 1.45 9.4% 10.1 11.9 Y 14.6 The T-bill rate is 3.5 percent, and the expected return on the market is 11 percent. a. Which projects have a higher expected return than the firm's 11 percent cost of capital? b. Which projects should be accepted? C. Which projects would be incorrectly accepted or rejected if the firm's overall cost of capital was used as a hurdle rate? CHAPTER 12 Risk, Cost of Capita