The Figure Below Shows the Possible Routes from City a to City

Multiple Choice

The figure below shows the possible routes from city A to city M as well as the cost (in dollars) of a trip between each pair of cities (note that if no arc joins two cities it is not possible to travel non-stop between those two cities) . A traveler wishes to find the lowest cost option to travel from city A to city M. Note: This question requires Solver.
Formulate the problem in Solver and find the optimal solution. Which of the following nodes are not visited?

A) A
B) B
C) C
D) A and B
E) A and C