Choose the complex sentence from the following options:
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There are recent complaints concerning the local school in my area.
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The canteen in this school smells of grease and fried food.
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They serve unhealthy, unappetizing food and the students prefer to bring food from home.
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Although the parents of the students have raised an alarm regarding the food standards, the school authorities haven't brought about much improvement.
A complex sentence is made up of two or more clauses, where at least one
of them should be independent, i.e., complete in meaning. The other
clause/clauses should be dependent; it should depend on the
main/independent clause for its complete meaning. From the options, D contains a complex sentence. The dependent clause begins with the conjunction 'although' and depends on the main clause "the school authorities haven't...improvement" for its complete meaning. Hence D is the complex sentence. Option A is a simple sentence; it contains only one clause. Similarly, Option B is also a simple sentence which contains one clause. Hence A and B are incorrect. Option C contains a compound sentence, both clauses are independent making C incorrect.