Which of the following picture might best describe a soap or detergent? 
Definitions:
Satisfaction
A feeling of fulfillment or contentment with one's achievements, status, or situation.
Naturalistic Observation
A research method involving the systematic observation and recording of behavior in its natural context without intervention.
Double-Blind Procedure
An experimental technique where both the subjects and the researchers are unaware of who has been given a specific treatment, in order to avoid any prejudice.
Case Study
A research approach that investigates a topic or individual in depth over a specified period of time.
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