Why should the corporate cost of capital (CCC) as defined in our textbook not be used to evaluate all projects that a company has under consideration?

a) Because different projects may have varying levels of risk and return, requiring different discount rates.
b) Because the corporate cost of capital is solely based on historical data, which may not reflect future project performance.
c) Because using the CCC for all projects can lead to underestimation or overestimation of project value.
d) Because the CCC does not account for project-specific factors such as industry trends and market conditions.