Dimensions of $\large\frac{1}{2} \in_0 E^2$ where $T_n$ primitively and $E_n$ electric field

Question

$\begin{array}{1 1} (a) \;ML^2T^{-2}\\ (b) \;ML^{-1}T^{-2} \\ (c) \;ML^2T^{-1} \\ (d) \;MLT^{-1} \end{array} $