For a transparent medium, relative permeability and permittivity, ${\mathrm{\mu }}_{\mathrm{r}}$ and ${\in }_{\mathrm{r}}$ are 1.0 and 1.44 respectively. The velocity of light in this medium would be,

• A

  $4.32\times {10}^8 \mathrm{m}/\mathrm{s}$

• B

  $2.5\times {10}^8 \mathrm{m}/\mathrm{s}$

• C

  $3\times {10}^8 \mathrm{m}/\mathrm{s}$

• D

  $2.08\times {10}^8 \mathrm{m}/\mathrm{s}$