The soil absorbs sunlight. Water filters through the soil. Organic matter is decayed in the soil. The soil is exposed to air.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: How do the nutrients necessary for plant growth get into the soil?
Possibilities:
- The soil absorbs sunlight.
- Water filters through the soil.
- Organic matter is decayed in the soil.
- The soil is exposed to air.

Organic matter is decayed in the soil.