Which two of the following five physical parameters have the same...

(1) Energy density, $$\begin{aligned} & =\frac{\text{ Energy }}{\text{ Volume }} \\ & =\frac{\left[\mathrm{ML}^2 \mathrm{~T}^{-2}\right]}{\left[\mathrm{L}^3\right]}=\left[\mathrm{ML}^{-1} \mathrm{~T}^{-2}\right] \end{aligned}$$ (2) Refractive index hole no dimensions. (3) Dielectric constant has no dimensions. (4) Young's modulus, $Y=\frac{F l}{A \Delta l}=\frac{\left[\mathrm{MLT}^{-2}\right][\mathrm{L}]}{\left[\mathrm{L}^2\right][\mathrm{L}]}=\left[\mathrm{ML}^{-1} \mathrm{~T}^{-2}\right]$ (5) Magnetic field, $B=\frac{F}{I l}=\frac{\left[\mathrm{MLT}^{-2}\right]}{[\mathrm{A}][\mathrm{L}]}=\left[\mathrm{MT}^{-2} \mathrm{~A}^{-1}\right]$ Therefore, option (c) is correct.