The Following Information Is to Be Used for the Questions

Multiple Choice

The following information is to be used for the questions below:
GATRA,the Greater Attleboro-Taunton Regional Transit Authority serves six cities (City 1-City 6) .While there are many restrictions (primarily roads on which they may not travel) ,they do have some choice of routes.The distances between cities,along permitted routes,are presented below.
-What is the shortest route?

A) 1-3,3-5,5-6
B) 1-2,2-3,3-4,4-5,5-6
C) 1-3,3-4,4-5,5-6
D) 1-2,2-3,3-5,5-6
E) None of the above