What is the equivalent capacity of combination of capacitors ?

• A

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

• B

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

• C

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

• D

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