The sentences are clearly stating about " plastic pollution in oceans," so sentence (4) states air pollution must be removed from the conclusions. As a result, option(c) or (iii): "sentence 4" is the correct answer.
(1) Plastic pollution, as well as other forms of pollution, has become a major issue in the world's oceans.
(2) It has contributed to climate change by increasing greenhouse gas emissions.
(3) Plastic bags and other goods also pose a hazard to marine life.
(5) To summarise, state and municipal governments must develop new rules and programmes to avoid the growth of plastic in the oceans.
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