Physician: Hatha yoga is a powerful tool for helping people quit smoking. In a clinical trial, those who practiced hatha yoga for 75 minutes once a week and received individual counseling reduced their smoking and cravings for tobacco as much as groups once a week and had individual counseling.
What this question is testing
Your task
Find the assumption the argument requires in order for its conclusion to hold.
Common trap
Answers that would help the argument but aren't strictly required (sufficient, not necessary).
Winning move
Negate each choice — the right one breaks the argument when negated.
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