Which of the following is an important reason for the wide biodiversity in the forests of southeast China?

An important reason for the wide biodiversity in the forest of southeast China is:

The climate where the forests are located changes on a regular basis.

Explanation:

This answer is backed by the following reasons: First of all, the southeast of China is a climate that changes very often from natural reasons and for the human impact on nature. Now, China is very diverse. It has deserts and humid forests inside its borders. Its southeast is mainly composed of the subtropical monsoon and tropical monsoon zones. Making them available for changes in climate and rich for species diversity.

just took the test the answer is b.