A charge `q` is enclosed by an imaginary Gaussian surface.
If radius of surface is increasing at a rate `(dr)/(dt)= K`, then
A. flux linked with surface is increasing at a rate `(dphi)/(dt)=K`
B. flux linked with surface is decreasing at a rate `(dphi)/(dt)=-K`
C. flux linked with surface is decreasing at a rate `(dphi)/(dt)=(1)/(K)`
D. flux linked with surface is `(q)/(epsilon_(0))`