Identify the pair whose dimensions are equal

The dimensional formula $[ML^0T^{-3}]$ is more closely associated with

If $\varepsilon_0$ is the permittivity of free space and $E$ is the electric field, then $\varepsilon_0 E^2$ has the dimensions

Dimensional formula $M{L^2}{T^{ - 3}}$ represents

If the dimensions of a physical quantity are given by $M^aL^bT^c$ ,then physical quantity will be 

Which of the following quantities is dimensionless