A $50\mathrm{.}0$ N box is at rest on a horizontal surface. The coefficient of static friction between the box and the surface is $0\mathrm{.}50,$ and the coefficient of kinetic friction is $0\mathrm{.}30.$ A horizontal $20\mathrm{.}0$ N force is then exerted on the box. The magnitude of the acceleration of the box is most nearly

$($A$)0\frac{m}{s^2}$

$($B$)0\mathrm{.}5\frac{m}{s^2}$

$($C$)1\mathrm{.}0\frac{m}{s^2}$

$($D$)4\mathrm{.}0\frac{m}{s^2}$