Electric Flux and Gauss's Law

2023 1 question

1. 1 Electric Charges and Fields Easy
   If $\oint_S \vec{E}\cdot d\vec{S}=0$ over a surface, then:
   A the electric field inside the surface is necessarily uniform. B the number of flux lines entering the surface must be equal to the number of flux lines leaving it. C the magnitude of electric field on the surface is constant. D all the charges must necessarily be inside the surface.
   Check Answer