Which two of the following five physical parameters have same dimensions? (i) energy density (ii) refractive index (iii) dielectric constant (iv) Young's modulus (v) magnetic field

Dimension of magnetic field in $M, L, T$ and $C$ (Coulomb) is given as:

A quantity $X$ is given by $X={ϵ}_{0}L\frac{\Delta V}{\Delta t}$ where ${ϵ}_0$ is the permittivity of free space, $\mathrm{L}$ is length, $\Delta V$ is the potential difference and $\Delta t$ is time interval. The dimensions of $X$ are the same as for

Speed of light $c$, acceleration due to gravity $\left(g\right)$ and pressure $\left(p\right)$ are taken as fundamental units, the dimensions of the gravitational constant $G$ are: