In a regular polygon of `n` sides, each corner is at a distance `r` from the centre. Identical charges are placed at `(n-1)` corners. At the centre, the intensity is `E` and the potential is `V`. The ratio `V//E` has magnitude
A. `rn`
B. `r(n-1)`
C. `(n-1)//r`
D. `r(n-1)//n`
