The dimension of (1/2) ${\mathrm{\epsilon }}_0{\mathrm{E}}^2({\mathrm{\epsilon }}_0$ : 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

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