For her senior project a psychology student is interested in studying how satisfied students are with the campus counseling center. She is preparing a survey to gather student opinion data. She randomly selects courses from each college department and obtains permission from the course instructors to administer her survey to their students. What is the student trying to achieve by selecting participants in this way?

She is attempting to obtain results from students who are most likely to use the campus counseling center

She is attempting to obtain survey results that are representative of the entire campus population.

She is attempting to identify survey respondents who can later be interviewed to obtain more detailed information.

She is attempting to overcome the placebo effect that occurs in research where surveys are used as the measurement tool.