Answer:
B) Project B has below-average risk and an IRR = 8.5 percent.
Explanation:
Since the evaluation is based on IRR, use IRR rule that says you accept a project if its IRR > Cost of capital(WACC in this case)
Project A's IRR of 9% is < 10% WACC for average risk projects hence reject it.
Project B's IRR of 8.5% is > 8% WACC for below- average risk projects hence accept it.
Project C's IRR of 11% is < 12% WACC for above- average risk projects hence reject it.