Definitely A. B, C, and D have nothing to do with finding the main idea
The most accurate way to describe the excerpt is to choose the option - it is a dependent clause. This means that something needs to be added - you need to finish the sentence so that it becomes an independent clause, and not a subordinate one.
Symbolism is a figure of speech used for when an author wants to create a certain mood or emotion whilst writing a book or a novel.
I am pretty sure that it is it welcome
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