The correct answer is A, WHEN THEY ARRIVED AT THE BEACH.
In English language, an adverb is one of the part of speech. An adverb is a part of speech that talk more or qualifies a verb. It can also be used to qualify an adjective, another adverb or a clause. An adverbial dependent clause refers to an adverbial clause that can not stand alone. In the question given above, the statement given in option A is an adverbial clause, which quality the verb 'arrived'.
Answer:In Harper Lee's To Kill A Mockingbird, Mr. Raymond tells Scout that when Dill grows up "he won't cry about the simple hell people give other people--without even thinking. Cry about the hell white people give colored folks, without even stopping to think that they're people too!
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