Industrial plants located along the river basin must adhere to strict environmental standards to ---- harmful chemical discharges.

Answer and explanation

Correct answer: B. curtail

  1. Step 1: Environmental standards require factories to decrease or limit toxic pollutant emissions.
  2. Step 2: 'Curtail' means to reduce in extent or quantity, or impose a restriction on.
Answer
curtail.
Why not the others: 'Augment' means to increase; 'Fabricate' means to invent or manufacture; 'Instigate' means to incite or provoke.

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