A telescope that uses a mirror $249$ cm in diameter is just able to resolve a double$-$star system that is $1\mathrm{.}5$ light$-$years away. Assume the light from the stars has a wavelength of $691$ nm$.$ How far apart are the two stars? One light year $=9\mathrm{.}461015$ m$.($Use the approximation for min: min $.)$

Group of answer choices

$8\mathrm{.}5108$ m

$9\mathrm{.}8107$ m

$9\mathrm{.}8108$ m

$4\mathrm{.}8109$ m

$8\mathrm{.}5109$ m