What is the primary characteristic of the Amazon rainforest mentioned in the passage?

The Amazon rainforest is the largest tropical rainforest in the world. It covers an enormous area across nine South American countries, with the majority of it located in Brazil. This vital ecosystem is home to an incredible diversity of plant and animal species, many of which are found nowhere else on Earth. The Amazon also plays a crucial role in regulating global climate patterns.

What is the primary characteristic of the Amazon rainforest mentioned in the passage?

1. A.Its role in global climate regulation
2. B.Its location in nine South American countries
3. C.Its extensive biodiversity
4. D.Its status as the largest tropical rainforest