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Discussion

Consider the following statements about hail suppression programmes.
1. Their theoretical basis is beneficial competition among embryos.
2. Rigorous evaluation has not established a clear effect.
3. Randomised trials have proved them reliably effective.

  • A.All of them
  • B.1 and 2 only
  • C.3 only
  • D.1 only

Answer: B

The first two are correct and reflect the assessments of national bodies. The third is not supported, and several major trials found no statistically significant reduction. National assessments have remained cautious throughout.

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