A point charge causes an electric flux of $$-2 \times 10^{4}\,\text{N m}^2 \text{C}^{-1}$$ to pass through a spherical Gaussian surface of 8.0 cm radius, centred on the charge. The value of the point charge is : (Given $$\varepsilon_0 = 8.85 \times 10^{-12}\,\text{C}^2 \text{N}^{-1} \text{m}^{-2}$$ )

A

$$15.7 \times 10^{-8}\,\text{C}$$

B

$$17.7 \times 10^{-8}\,\text{C}$$

C

$$-15.7 \times 10^{-8}\,\text{C}$$

D

$$-17.7 \times 10^{-8}\,\text{C}$$