The dimension of (1/2) ${\mathrm{\epsilon }}_0{\mathrm{E}}^2 \left({\mathrm{\epsilon }}_0\right.$ : permittivity of free space;  E : electric field) is 

• A

  ${\mathrm{MLT}}^{{ }^{-1}}$

• B

  ${\mathrm{ML}}^2{\mathrm{T}}^{-2}$

• C

  ${\mathrm{ML}}^{-1}{\mathrm{T}}^{-2}$

• D

  ${\mathrm{ML}}^2{\mathrm{T}}^{-1}$