The correct answer would be a qualitative study.
Qualitative research focuses on using methods of investigation to understand social phenomena in naturalistic settings through processes such as observation, interviews, thematic analysis, discourse analysis and so forth all without using numerical data as would be the case in quantitative research. In this scenario the researcher could interview the students and teaching staff to gain their opinions and insight into the subject matter of the research. The researcher could also observe behaviors of the students as another method of investigation.