A static point charge Q is located just above the centre C ($$\delta \to 0$$) of a horizontal circle of radius R on its geometric axis, as shown in figure. The magnitude of electric flux through this circle is

A

Zero

B

$$\frac{Q}{4\varepsilon_0}$$

C

$$\frac{Q}{2\varepsilon_0}$$

D

$$\frac{Q}{\varepsilon_0}$$