A completely ionized beryllium atom $($net charge $=+4e)$ is accelerated through a potential difference of $6\mathrm{.}0$ V $.$ What is the increase in kinetic energy of the atom?

A$)$ Zero eV

B$)0\mathrm{.}67$ eV

$+4c$

C$)4\mathrm{.}0$ eV

D$)6\mathrm{.}0$ eV

E$)-24$ eV