A parallel plate capacitor is made of two circular plates separated by a distance of 5 mm and with a dielectric of dielectric constant 2.2 between them. When the electric field in the dielectric is 3 x 10⁴ V/m, the charge density of the positive plate will be close to: 

• A

  $6\times {10}^4\mathrm{C}/{\mathrm{m}}^2$

• B

  $6\times {10}^{-7}\mathrm{C}/{\mathrm{m}}^2$

• C

  $3\times {10}^{-7}\mathrm{C}/{\mathrm{m}}^2$

• D

  $3\times {10}^4\mathrm{C}/{\mathrm{m}}^2$