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Option 2 : PRSQ

The passage is about global warming as it is introduced in the first sentence itself. The second sentence will be ‘It is caused by the greenhouse effect of increased level of greenhouse gases’ as it talks about the cause of global warming. The ‘it’ in the second sentence can only refer to global warming. No other sentence is fit to occupy the position of the second sentence. It is mentioned that greenhouse effect of greenhouse gases causes global warming and so the third sentence will be ‘Greenhouse gases include carbon dioxide, CFCs, etc.’ as it continues on what these greenhouse gases are. The fourth sentence will be ‘The increasing use of fossil fuels is a major cause of carbon dioxide emission’ as this is an elaboration on one of the greenhouse gases: carbon dioxide. The fifth sentence further elaborates on what causes carbon dioxide emission and is the continuation of the fourth sentence on what causes the emission of carbon dioxide. The correct sequence is PRSQ.
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