which of the following would cause the WACC to decrease?

a firms beta increases from investing in a project that is riskier than the firms average project

the goverment passes a law that increases the corporate tax rate

a firm announces plans to retire all of its outstanding bonds, leaving it with no debt outstanding

a firm finances 100% of a new project by issuing new shares

investirs become more risk averse and the slop of the security market line increases