Assume that an electric field $\overrightarrow{\mathrm{E}}=30 {\mathrm{x}}^2\mathrm{i}$ exists in space. Then the potential difference ${\mathrm{V}}_{\mathrm{A}}-{\mathrm{V}}_{\mathrm{O}}$, where V_O is the potential at the origin and V_A the potential at x = 2 m is :

• A

  80 J

• B

  120 J

• C

  -120 J

• D

  -80 J