Questions 36, 37 and 38 are based on the following description.
Five persons A, B, C, D and E are standing on the vertices of a regular pentagon such that A is to the west of B and C is to the east of E. Let dist (X, Y) denote the distance of the shortest route from X and Y along the pentagon (for instance, if X and Y are on two adjacent vertices of the pentagon, then dist (X, Y) = 1)

Which of the following is necessarily true?