In mid$-2015,$ Wondafone had $$10$ billion in debt, total equity capitalization of $$99$ billion, and an equity beta of $1\mathrm{.}5.$ Wondafone has $$20$ billion in cash and risk$-$free securities in its assets. Assume that the risk$-$free rate of interest is $3\%$ and the market risk premium is $4\%.$ What is the beta of Wondafone$$s business assets assuming perfect capital markets and a high credit rating for the firm?

A$.$

$1\mathrm{.}36$

B$.$

$1\mathrm{.}67$

C$.$

$1\mathrm{.}5$

D$.$

$0\mathrm{.}5$