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Option 2 : (B)

The correct answer is '(B)'.

Reading the sentence we find that:

  • The determiner much used in part B is incorrect.
  • Much is used with uncountable nouns. 
    • E.g., - We do not have much time. (Time is an uncountable noun)
  • common environmental issues is a countable noun. We should use most before it.  
  • Therefore the error lies in part B of the sentence. 

The correct sentence will be: One of the most common environmental issues is global warming which causes many serious environmental problems. 

  • Much is used with singular uncountable nouns.
  • Many is used with plural nouns.
  • Most is the superlative form of much and many. 
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