Answer:
B. the number of field lines on the source charge
Step-by-step explanation:
As we know that electric flux is defined as the number of electric field lines passing through a given area.
So here electric flux due to a point charge "q" is given by

so here we know that flux depends on the magnitude of charge and hence we can say that number of filed lines originating from a point charge will depends on the magnitude of the charge.
so here correct answer will be
B. the number of field lines on the source charge