An organization with a class B network address has $200$ subnets. The most suitable subnet mask for the organization is

A$.$

$255\mathrm{.}255\mathrm{.}248\mathrm{.}0$

B$.$

$255\mathrm{.}255\mathrm{.}255\mathrm{.}0$

C$.$

$255\mathrm{.}255\mathrm{.}254\mathrm{.}0$

D$.$

$255\mathrm{.}255\mathrm{.}252\mathrm{.}0$