Which of the graphs below are connected? 
Definitions:
Drowsiness
A state of feeling abnormally sleepy or tired, which can interfere with functioning and alertness.
Randomized Clinical Trials
Studies in which participants are randomly assigned to a treatment or control group to evaluate the effectiveness of medical interventions.
Psychological Treatment
Therapeutic interventions designed to address mental health issues through dialogue, behavior modification, and other methodologies without the use of medication.
Testimonials
Statements or endorsements, often given by satisfied customers or clients, used as a tool of persuasion in marketing or to attest the quality of a product or service.
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