medium · LSAT Logical Reasoning

No lighthouse with an unreliable generator system may remain automated. Beacon L remains automated although its primary generator failed twice. Therefore its backup system is reliable.

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

  1. Beacon L's backup generator is newer than its primary generator.
  2. Automated lighthouses use less staff than staffed lighthouses.
  3. Beacon L is inspected more often than remote beacons.
  4. With primary failure, automation requires a reliable backup.
  5. Primary-generator failure is costly to repair.

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