The electric field in a region is given by $\overrightarrow{\mathrm{E}}=\left(\mathrm{A}\mathrm{x}+\mathrm{B}\right)\mathrm{ }\widehat{\mathrm{i}} ,$ where $\mathrm{E}$ is in $\mathrm{N}{\mathrm{C}}^{-1}$ and $x$ is in metres. The values of constants are $\mathrm{A}=20\mathrm{ }\mathrm{S}\mathrm{I}$ unit and $\mathrm{B}=10\mathrm{ }\mathrm{S}\mathrm{I}$ unit. If the potential at $x=1$ is ${\mathrm{V}}_1$ and that at $x=-5$ is ${\mathrm{V}}_2,$ then ${\mathrm{V}}_1-{\mathrm{V}}_2$ is

• A

  $320 \mathrm{V}$
• B

  $-520 \mathrm{V}$
• Correct answer
  C

  $180 \mathrm{V}$
• D

  $-48 \mathrm{V}$

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