the main nutrient in all foods a type of grain found in cereals a natural substance that makes up rocks the decomposed plant matter found in soil
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of the following best describes a mineral?
Possibilities:
- the main nutrient in all foods
- a type of grain found in cereals
- a natural substance that makes up rocks
- the decomposed plant matter found in soil

a natural substance that makes up rocks