A group of researchers is interested in studying the impact of a new educational program on student performance in mathematics. They are considering three different approaches to gather data:

Question 1 options:

123	Approach C: The researchers randomly assign 200 students to either participate in the new educational program or continue with the standard curriculum. At the end of the school year, they compare the math test scores of the students in both groups.
123	Approach B: The researchers send out a questionnaire to 1,000 teachers asking them about their perceptions of the new educational program and whether they believe it has improved their students' math performance. They collect and analyze the responses.
123	Approach A: The researchers randomly select 500 students from various schools who have been exposed to the new educational program. They then collect the students' end-of-year math test scores and compare them to the scores from the previous year before the program was implemented.