Passage 1 The increase in popularity means that more people are climbing Everest than ever. It's true that the economy of Nepal benefits from the hundreds of climbers each year. The government requires climbers to purchase a climbing permit. Climbers who hire Nepalese guides are also helping the local economy. However, more climbers on the mountain cause a number of problems. Large numbers of climbers on the mountain at once can be unsafe, especially when teams get close to the top of the mountain. This was not a concern in the early days of Everest explorers. Now, hiking companies encourage climbing teams to take turns when they get close to the peak. Climbers put in too much effort to get caught in a traffic jam near the summit.

Passage 2 The tourism industry surrounding Everest also impacts the environment. The biggest and most obvious impact is the amount of waste climbers leave behind. I have witnessed it firsthand. More and more waste is left each year. This includes empty oxygen and fuel tanks, abandoned tents, batteries, empty cans, and bottles. The government of Nepal requires each climber to bring about eight kilograms of waste back when they descend the mountain. They also make climbers pay some extra money before they start climbing. This money is only returned if climbers come back with the same amount of equipment they started with. When a climber returns with all of their gear, it means no waste was left on the mountain. In recent years, climbers and guides have removed more than 16 tons of litter from Everest. I have been a part of several expeditions that have climbed partway up the mountain just to clean it up. There are no estimates of how much waste remains on the mountain.

How is the structure of Passage 1 similar to the structure of Passage 2?
A. Both passages use a cause and effect structure.
B. Both passages use a chronological order structure.
C. Both passages use a compare and contrast structure.
D. Both passages use a problem and solution structure.