Answer:
direct, naturalistic, and unobtrusive
Explanation:
This is a type of observation that involves observing subjects in their natural environment free of any alterations or obstructions. Here subjects are unaware they are being observed and act exactly their normal selves. In the example Jacqueline observes the subject-a child- while the subject is in his natural environment. Psychologists use this method to study and evaluate a subject in his environment without any interventions.
