medium · LSAT Logical Reasoning

Since a new exercise program began at the local community center, residents' reported happiness levels have risen. The center's director concluded that the program is responsible for the increase in happiness.

Which one of the following, if true, most strengthens the director's conclusion?

  1. The program offers separate structured tracks for first-time beginners and for advanced participants.
  2. Most residents who enrolled had already described themselves as fairly happy in earlier surveys.
  3. Around the time the program began, the center also renovated its library and opened a popular cafe.
  4. Sustained physical activity prompts the brain to release endorphins, compounds linked to elevated mood.
  5. A national happiness index for the surrounding region also rose by a similar amount over those months.

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