Passage Summary: Dangerous activities are only okay if the person taking the risk either gets a special reward they couldn't get any other way or if they chose to do it of their own free will.

Reasoning: A rule is established stating that life-threatening activities are only acceptable if the participant either receives a unique net benefit or participates voluntarily.

Analysis: This stimulus provides a biconditional principle, signaled by the phrase 'if and only if.' This means the conditions are both necessary and sufficient for an activity to be deemed 'acceptable.' To find a matching judgment, look for a scenario that either satisfies one of the two conditions (benefit or voluntariness) to conclude it is acceptable, or a scenario that fails both conditions to conclude it is unacceptable. Be careful not to pick an answer that concludes an activity is acceptable while failing both requirements.