More gases enter the balloon. The gas inside the balloon gets much hotter. The air pressure surrounding the balloon decreases. Sunlight breaks down the material of the balloon.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: A weather balloon is about 2 meters wide when it is near the ground. It grows to about 6 meters wide at higher altitudes. Which change most likely makes the balloon become wider at higher altitudes?
Possibilities:
- More gases enter the balloon.
- The gas inside the balloon gets much hotter.
- The air pressure surrounding the balloon decreases.
- Sunlight breaks down the material of the balloon.

The air pressure surrounding the balloon decreases.