remove earthworms add more water to the soil increase the amount of pesticide he uses mix decomposed plant matter into the soil
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Drake has started a garden. What can Drake do to enrich the soil so that his plants will grow better?
Possibilities:
- remove earthworms
- add more water to the soil
- increase the amount of pesticide he uses
- mix decomposed plant matter into the soil

mix decomposed plant matter into the soil