The plates of a parallel plate condenser are pulled apart with a velocity \[v\]. If at any instant their mutual distance of separation is \[d\], then the magnitude of the time of rate of change of capacity depends on \[d\] as follows [MP PET 1991]

• A.            \[\frac{1}{d}\]                     
• B.            \[\frac{1}{{{d}^{2}}}\]
• C.            \[{{d}^{2}}\]                         
• D.            \[d\]