Answer:
naturalistic-observation
Step-by-step explanation:
The scientist is using naturalistic-observation in his/her study. naturalistic-observation is a research technique that involves watching or studying the research subjects in their natural environment or state. Watching the cars and the parking lot is a naturalistic-observation since the subjects are unaware of the study, they will behave normally as they would in their natural state. Results from this type of research is highly representative of the behaviours of the subjects of the study.