The correct option is B False
False.
Gauss's law, in integral form, relates the flux of the electric field through some closed surface S to the charge enclosed within the volume bounded by S.
∮SE.da=Qencϵ0
Because we do not know the electric field, Gauss's law is only useful when we can remove the electric field from the integral, which happens when the charge distribution displays certain spatial symmetries (spherical, cylindrical, planar). Therefore, Gauss's law is useful for the calculation of electrostatic field when the system possess symmetry.