Sonali is standing on one side of a 7 m wide road as shown below. She wants to estimate the distance (D) between two light poles on the other side without crossing the road.
Which of the following expressions represent D in terms of p and r?
(A) 7r/p m
(B) pr/7 m
(C) pr/(p+7) m
( D) (r(p+7))/p m