<s>[INST] Pangat, your friend, is going on a road trip to visit all the cities in a country. There are 10 cities and roads connecting each pair of cities. Since there are so many cities, Pangat decided to use a computer program to plan the shortest possible route that visits each city exactly once and returns to the starting city. In other words, Pangat wants to solve the classic Traveling Salesman Problem, which is an NP-hard problem.

The program generated the following route:
City 1 -> City 2 -> City 3 -> City 4 -> City 5 -> City 6 -> City 7 -> City 8 -> City 9 -> City 10 -> City 1

However, during the road trip, Pangat realizes that the program made an error in the route, and it is not the shortest possible route. After analyzing the distances between cities, Pangat notices that the distance between City 8 and City 9 is much larger than any other distance. Since Pangat is a computer science student, she decides to apply her knowledge of algorithms to optimize the route.

To simplify the problem, let's assume that the distances between cities form a metric space, meaning that they satisfy the triangle inequality (i.e., the distance from City A to City B plus the distance from City B to City C is greater than or equal to the distance from City A to City C). This means that the shortest distance between two cities is a straight line.

Which of the following options is the most efficient way to optimize Pangat's route?[/INST]