An unchanged capacitor with a solid dielectric is connected to a similar air capacitor charged to a potential of `V_(0).`. If the common potential after sharing of charges becomes V, then the dielectric constant of the dielectric must be
A. `V_(0)//V`
B. `(V)/(V_(0))`
C. `((V_(0)-V))/(V)`
D. `((V_(0)-V))/(V_(0))`