A point charge q is placed at a distance a/2 directly above the centre of a square of side a. The electric flux through the square is

• A

  $\frac{\mathrm{q}}{{\mathrm{\epsilon }}_{\mathrm{o}}}$

• B

  $\frac{\mathrm{q}}{{\mathrm{\pi \epsilon }}_{\mathrm{o}}}$

• C

  $\frac{\mathrm{q}}{4{\mathrm{\epsilon }}_{\mathrm{o}}}$

• D

  $\frac{\mathrm{q}}{6{\mathrm{\epsilon }}_{\mathrm{o}}}$