A parallel sentence mentions the same grammatical expression twice. I would go with "D". 'Passed' and 'Demonstrated' are both past tense words that express the same past tense grammatical idea.
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Answer:
There are actually 2 correct answers in these examples. Number 2, and number 4 are the same, and are both correct.
It is very nice and I like it
Propaganda is information that is biased or misleading and is used to promote a political cause or point of view.
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