SPK Inc. estimates that its average$-$risk projects have a WACC of $10\%,$ its below$-$average risk projects have a WACC of $8\%,$ and its above$-$average risk projects. have a WACC of $12\%.$ Which of the following projects $($ ;$B,$ and $C)$ should the company accept?

a$.$ Project $B,$ which is of below$-$average risk and has a return of $8\mathrm{.}5\%.$

b$.$ Project C$,$ which is of above$-$average risk and has a return of $11\%.$

c$.$ Project A$,$ which is of average risk and has a return of $11\%.$

d$.$ Projects A and $B$ cante accepted

e$.$ None of the above projects should be accepted