The total value $($debt plus equity$)$ of Wilson Dover Inc. is $$500$ million and the face value of its $1-$year coupon debt is $$200$ million. The volatility $(\backslash$sigma $)$ of Wilson Dover's total value is $0\mathrm{.}60,$ and the risk$-$free rate is $5\%.$ Assume that N$($d$1)=0\mathrm{.}9720$ and N$($d$2)=0\mathrm{.}9050.$

Refer to the data for Wilson Dover Inc. What is the value $($in millions$)$ of Wilson Dover's debt if its equity is viewed as an option?

a$.$ $$247\mathrm{.}82$

b$.$ $$186\mathrm{.}19$

c$.$ $$167\mathrm{.}57$

d$.$ $$204\mathrm{.}81$

e$.$ $$225\mathrm{.}29$