If Town A, B, and C are in a line in that order, the distance from
A to C would be 5 + 4 = 9 miles. If the Towns are arranged in a line
in the order A, C, and B, then the distance from A to C would be
5 – 1 = 4. The distance from A to C can be 8 or 4 if A, B,
and C are the vertices of a triangle. However, the distance from
A to C can never be 10 nor any number greater than 9 because the distance
cannot exceed the sum of 5 and 4—as in the first case. E is the answer.