Answer and explanation

Correct answer: C. From the sudden drop in rainfall, the hydrologists inferred that the spring would run dry by August.

  1. Step 1: 'Infer' means to draw a conclusion from evidence; the person who reasons is the subject.
  2. Step 2: Only the sentence 'From the sudden drop in rainfall, the hydrologists inferred that the spring would run dry by August' has the hydrologists as the ones who conclude from the evidence (the rainfall drop).
Answer
From the sudden drop in rainfall, the hydrologists inferred that the spring would run dry by August.
Why not the others: The others give 'infer' to a thing, swap it with 'imply', or use an impossible passive.

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