If a firm has a debt$-$equity ratio of $1\mathrm{.}0,$ then its total debt ratio must be which one of the

following? $($Hint: Use the relationships of the three debt ratios$)$

Multiple Choice

$5$

$2\mathrm{.}0$

$1\mathrm{.}0$

$0$

$1\mathrm{.}5$