UPSC Civil Services 2017 Prelims General Studies Paper II

DIRECTIONS for the following que (76-78) : Consider the given information and answer the three items that follow.
Eight railway stations A, B, C, D, E, F, G and H are connected either by two way passages or one way passages. One way passages are from C to A, E to G, B to F, D to H, G to C, E to C and H to G. Two way passages are between A and E, G and B, F and D, and E and D.