Sunlight converts atmospheric nitrogen to a form usable by protists. Plant leaves convert atmospheric nitrogen to a form usable by animals. Bacteria in soil convert atmospheric nitrogen to a form usable by plants. Invertebrate animals in soil convert atmospheric nitrogen to a form usable by fungi.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of the following correctly explains how atmospheric nitrogen is converted to nitrogen compounds used by living organisms?
Possibilities:
- Sunlight converts atmospheric nitrogen to a form usable by protists.
- Plant leaves convert atmospheric nitrogen to a form usable by animals.
- Bacteria in soil convert atmospheric nitrogen to a form usable by plants.
- Invertebrate animals in soil convert atmospheric nitrogen to a form usable by fungi.

Bacteria in soil convert atmospheric nitrogen to a form usable by plants.