Are C & D the same question? I think you have made a typing error.
Answer:
I think it would be A. Leave it as is, because the other answers don't sound right, or don't have any commas.
Hope this helped! :)
Parallel structure is the use of the same grammatical structure in a text: the correct answer is A. It does not matter then whether this structure has articles, complex phrases or adverb-verbs, as long as the structure of two or more sentences is the same!
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Answer:
im confused can u explain this problem?
Explanation: