$($v$)$ Planet Kzin has the same radius as Earth, but a different mass. If an object is dropped from rest from a height $\backslash ($ h $\backslash )$ on Kzin, its speed when it hits the ground is $4$ times what it would be if it were dropped from the same height on Earth. The mass of Kzin is greater than the mass of Earth by a factor of:

$($A$)2$

$($B$)4$

$($C$)8$

$($D$)16$

$($E$)32$