One planet is orbiting around the sun, At a point P it is at minimum distance d1 from the sun and at that time speed is v1. If at a another point Q it is at maximum distance d2 from the sun then at this point the speed of planet will be -
(A) d1 2v1 / d22
(B) d2 v1 /d1
(C) d1 v1 /d2
(D) d22v1 /d12