A Point Charge Q Is Located at the Center of a Sphere

A point charge q is located at the center of a sphere of radius R.Also concentrically inside the sphere is a uniform ring having linear charge density $\lambda$ and radius a (a <R) .The flux through the sphere is

A) q/ $\varepsilon$ ₀.
B) (q + $\lambda$ *2 $\pi$ a) / $\varepsilon$ ₀.
C) (q - $\lambda$ *2 $\pi$ a) / $\varepsilon$ ₀.
D) 0.