Answer:
To better reframe this question to encourage students to ask questions instead of simply collecting information, you could use the phrase: "How does a country's population size contribute to its levels of air pollution?"
Step-by-step explanation:
The phrase "Which countries cause the most pollution?" would make the students perform a suplerfula research, without showing fundamentals and only indicate the name of the countries. However, the phrase "How does a country's population size contribute to its levels of air pollution?" encourages students to think, question, and devise detailed, accurate, and information-rich research.