For a Multi-Product Firm, If a Project's Beta Is Different

For a multi-product firm, if a project's beta is different from that of the overall firm, then the:

A) CAPM can no longer be used.
B) project should be discounted using the overall firm's beta.
C) project should be discounted at a rate commensurate with its own beta.
D) project should be discounted at the market rate.
E) project should be discounted at the T-bill rate.