the soil the water the plants the sunlight
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Students kept some crickets in a classroom tank. The tank was kept in an area where it would get several hours of sunlight a day. The tank contained one area with water, and another area with soil where plants were growing. From which source did the crickets gain all of their energy?
Possibilities:
- the soil
- the water
- the plants
- the sunlight

the plants