WACC: A company has a capital structure of $40\%$ debt $($with a $5\%$ yield$),20\%$ preferred stock $($with an $8\%$ yield$),$ and $40\%$ equity $($with an expected return of $12\%).$ What is the company's weighted average cost of capital $($WACC$)?$

Select one

A$.7\mathrm{.}6\%$

B$.8\mathrm{.}0\%$

C$.8\mathrm{.}4\%$

D$.9\mathrm{.}2\%$