When a Light Ray Travels Between Any Two Points,the Path

Multiple Choice

When a light ray travels between any two points,the path it takes is the one that (Hint: Eliminate answers you know are wrong. )

A) covers the greatest distance.
B) follows the greatest index of refraction.
C) avoids travel in more than one medium.
D) is the mean between the longest and the shortest paths.
E) takes the least time.