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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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