Six point charges are kept $60^{\circ}$ apart from each other on the circumference of a circle of radius $R$ as shown in the figure. The net electric field at the centre of the circle is . . . . . . . ($ \epsilon_{0} $ is the permittivity of free space)

• A
  $ -\frac{5Q}{8\pi\epsilon_{0}R^{2}}(\hat{i}+\sqrt{3}\hat{j}) $
• B
  $ -\frac{Q}{4\pi\epsilon_{0}R^{2}}(\sqrt{3}\hat{i}-\hat{j}) $
• C
  $ -(\frac{5Q}{8\pi\epsilon_{0}R^{2}})(\hat{i}-3\hat{j}) $
• D
  $ \frac{Q}{4\pi\epsilon_{0}R^{2}}(\sqrt{3}\hat{i}-\hat{j}) $