A university researcher wants to study the impact of a new healthy eating campaign on the dietary habits of college students. They recruit 200 volunteers from their university's student-athlete population to participate in the campaign. After six months, the researcher observes a significant improvement in the dietary habits of the participating student-athletes. Which of the following statements best describes the generalizability of these results?
The results can be generalized to all college students nationwide.
The results can be generalized to all students at the researcher's university.
The results can be generalized to student-athletes at the researcher's university, but not necessarily all college students.
The results cannot be generalized beyond the 200 volunteers because they were not randomly selected from a broader population.
