Answer and explanation

Correct answer: A. The report recommends raising wages, improving safety and reducing working hours.

  1. Step 1: Items in a list must have the same grammatical form.
  2. Step 2: The correct sentence has three gerunds: "raising", "improving" and "reducing".
Answer
The report recommends raising wages, improving safety and reducing working hours.
Why not the others: each other sentence mixes a gerund with an infinitive ("to reduce", "to raise", "to improve") or with a noun phrase ("the reduction"), which breaks the parallel form.

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