The electric potential $V(x)$ in a region around the origin is given by $V(x)=4 x^2$ volts. The electric charge enclosed in a cube of $1 \mathrm{~m}$ side with its centre at the origin is (in coulomb)

• A

  $8 \varepsilon_0$
• B

  $-4 \varepsilon_0$
• Correct answer
  C

  0
• D

  $-8 \varepsilon_0$

Hence, the correct answer is option: 'C'.