Which one is the correct answer?

The answer is B

Explanation:

Apoptosis is the process of programmed cell death. It is used during early development to eliminate unwanted cells; for example, those between the fingers of a developing hand. In adults, apoptosis is used to rid the body of cells that have been damaged beyond repair.

The plants may produce needed carbon dioxide.

Explanation:

This is the only benefit as medicine needs to be found, they won't be cut down, and they do take in toxins but it does not affect the study