Three plates of common surface area A are connected as shown. The effective capacitance will be:

• A

  $\frac{{\mathrm{\epsilon }}_0\mathrm{A}}{\mathrm{d}}$

• B

  $\frac{3{\mathrm{\epsilon }}_0\mathrm{A}}{\mathrm{d}}$

• C

  $\frac{3}{2}\frac{{\mathrm{\epsilon }}_0\mathrm{A}}{\mathrm{d}}$

• D

  $\frac{2{\mathrm{\epsilon }}_0\mathrm{A}}{\mathrm{d}}$