Answer:
B. The ash helps crops to grow because it is rich in minerals, such as magnesium ions, but it is deficient in nitrate ions.
Step-by-step explanation:
After the forest is being burned, ash and carbon dioxide increase on the surface of the ground. It is good for the plant to grow because the plant uses carbon dioxide for photosynthesis, and its root absorbs energy from the ground where ash is very good for the plant to grow.