The potential of a point B $(-20 \mathrm{m}, 30 \mathrm{m})$ taking the potential of a point A (30 m, -20 m) to be zero in an electric field $\overrightarrow{\mathrm{E}}=10\mathrm{x}\hat{\mathrm{i}}-20\hat{\mathrm{j}}{ \mathrm{NC}}^{-1}$ is

• A

  350 V

• B

  -100 V

• C

  300 V

• D

  3500 V