A charge q is placed inside a spherical cavity, made in an uncharged conducting sphere of radius R as shown. A point charge Q is placed at a separation d from the centre of solid sphere as shown in the figure.

A parallel plate air capacitor is charged by connecting its plates to the terminals of a battery. The battery is disconnected and a dielectric slab is introduced partially between the plates, as shown in the figure. Consider the change in the value of each quantity mentioned in the first column below from the time when no dielectric slab was introduced to the time when it was, and match it with the nature of change in it as mentioned in column on the right.

(A) – (s)
(B) – (p)
(C) – (r)
(D) – (q)