In the following $I$ refers to current and other symbols have their usual meaning. Choose the option that corresponds to the dimensions of electrical conductivity:

• A

  ${\mathrm{M}}^{-1}{\mathrm{L}}^{-3}{\mathrm{T}}^3\mathrm{I}$
• Correct answer
  B

  ${\mathrm{M}}^{-1}{\mathrm{L}}^{-3}{\mathrm{T}}^3{\mathrm{I}}^2$
• C

  ${\mathrm{M}}^{-1}{\mathrm{L}}^3{\mathrm{T}}^3\mathrm{I}$
• D

  $\mathrm{M}{\mathrm{L}}^{-3}{\mathrm{T}}^{-3}{\mathrm{I}}^2$

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