provide nutrients for the growing corn plant eliminate the need for weeding around the corn plant release oxygen for use by the corn plant supply all the water needed by the corn plant
I gave my students this multiple choice question: In the past, Native American Indians buried dead fish along with corn seeds. This technique was used because the decomposing dead fish would

Only one answer is correct among these 4 choices:
- provide nutrients for the growing corn plant
- eliminate the need for weeding around the corn plant
- release oxygen for use by the corn plant
- supply all the water needed by the corn plant

Could you tell me which one is correct?

provide nutrients for the growing corn plant