If the charges inside a sphere are $+2 \times 10^{-6} \ C$,$-5 \times 10^{-6} \ C$,$-3 \times 10^{-6} \ C$,and $+6 \times 10^{-6} \ C$,what is the total electric flux passing through the sphere?
- A$0$
- B$16 \pi \times 10^{-6} \ N \cdot m^2/C$
- C$8 \pi \times 10^{-6} \ N \cdot m^2/C$
- D$36 \pi \times 10^{-6} \ N \cdot m^2/C$
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