A parallel-plate capacitor is filled with a dielectric upto one-half of the distance between the plates. The manner in which, the potential between the plates varies is illustrated in the figure
.
A. The electroc field strength is greater in part `A`
B. The electric field strength is greater in part `B`
C. Dielectric slab fills the space of part `A`
D. Dielectric slab fills the space of part `B`