Answer: d. The company would accept more riskier than average projects than they should otherwise.
Step-by-step explanation:
A company's Weighted Average Cost of Capital can enable it know the calibre of risk to accept from new project because it shows the business risk of funding current business operations.
If a project will bring more risk to the company, the WACC should be adjusted so that the company will get a fair rate of return from the new project. If they do not adjust the new project for risk, not only will the company not get a fair return but they might also accept riskier projects because they will accept projects that they think have a lower risk than their WACC even though they are higher because they did not adjust their WACC.