Well, technically, you don't need insurance to drive a car. However, it is very important, and highly recommended. If you're vehicle happens to be stolen, or destroyed in any way, you have to pay for the issue out-of-pocket. That would really hurt bad financially, so without paying insurance, you're at a large risk.
I think it is the first answer choice " to explain why the Amazon Rainforest should be protected." Because that's what the passage is about. Someone explaining why the Rainforest should be protected and what will happen if it is destroyed.
