hard · LSAT Logical Reasoning

The orchard's yield will recover if pollination increases and no fungal outbreak occurs. Adding nesting tubes increased mason-bee visits while blossoms were open, and every increase in visits overlapping open blossoms increases pollination. No fungal spores were detected. Therefore, yield will recover.

Which one of the following, if assumed, enables the conclusion to be properly drawn?

  1. Absence of detected spores guarantees that no fungal outbreak occurred.
  2. Mason bees visited the tubes more often than any other kind of bee did.
  3. Bee visits during the bloom overlap the orchard's blossoms.
  4. Mason bees pollinate more efficiently than honeybees.
  5. Recovered yield will offset the cost of nesting tubes.

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