Hello.
The proccess of organizing ideas from the least to the most significant ones it's order of importance.
Order of importance is one of the most frequently-employed organizing principles used in writing. As it provides the details of a subject in a manner that makes sense for many, it makes a lot of writing easier to follow.
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Answer:
Simply because of the roaring engines of the luxury bus.
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I would have to agree I believe that the answer is going to be A.
