through a chemical called chlorophyll by using photosynthesis through a system of tubes by converting water to food
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of the following best explains how stems transport water to other parts of the plant?
Possibilities:
- through a chemical called chlorophyll
- by using photosynthesis
- through a system of tubes
- by converting water to food

through a system of tubes