Answer:
c.a survey.
Step-by-step explanation:
Survey: In psychology, the term survey is defined as a form of data collection tool that is being used to collect information about different persons. It generally gathers self-report data from participants understudy and focuses on the factual information about the participants or to collect opinions of the participants. A survey can either be quantitative or qualitative.
In the question above, the given study would be classified as a survey.