tasting water from a water fountain reading water test results studying the rules for purifying water investigating causes of water pollution
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Sophie investigates the water supply at her school and the things that affect it. Which action is a direct observation?
Possibilities:
- tasting water from a water fountain
- reading water test results
- studying the rules for purifying water
- investigating causes of water pollution

tasting water from a water fountain