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 exercise program offers separate tracks for beginners and for advanced participants.
  2. Most people who enrolled in the program already described themselves as fairly happy beforehand.
  3. Around the same time, the center renovated its library and opened a new cafe.
  4. Sustained physical activity prompts the brain to release endorphins, compounds linked to elevated mood.
  5. Residents who attended the most exercise sessions reported the largest gains in happiness.

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