There is a point charge +q inside a hollow sphere and a point charge -q just outside its surface. The total flux passing through the sphere

• A.  \[\frac{-q}{{{\in }_{0}}}\]                                
• B.  \[\frac{q}{{{\in }_{0}}}\]
• C.  \[\frac{2q}{{{\in }_{0}}}\]                               
• D.  zero.