If the spring length is increased from $4\mathrm{.}8$ cm to $14\mathrm{.}6$ cm when a mass of $30$ g is attached to the end of a spring, the spring constant is

Question $36$ options:

A$)$

$3\mathrm{.}0$ N$/$m

B$)$

$9\mathrm{.}8$ N$/$m

C$)$

$0\mathrm{.}31$ N$/$m

D$)$

$16$ N$/$m