b
As we know from gauss law that, \(\phi=\frac{ Q _{\text {inc }}}{\varepsilon_0}\) and also \(\phi\) is defined as \(\phi=\) E.da.

\(\Rightarrow\) The direction of electric field decides the nature of flux which further define the nature of charge and vice-verse.

\(\therefore \quad \Rightarrow\) From -ve charge \(\vec{E}\) comes inward or we can say \(\phi\) enters the gaussion surface but from +ve charge \(\phi\) leaves the surface as \(\vec{E}\).