If the acceleration due to gravity of a planet is half the acceleration due to gravity of earth’s surface and radius of planet is half the radius of the earth, the mass of planet in terms of mass of earth is
$\dfrac{M_{e}}{2}$
$\dfrac{M_{e}}{4}$
$\dfrac{M_{e}}{6}$
$\dfrac{M_{e}}{8}$