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:
Explanation:
The orange and brown leaves rustled as the bird soared passed them.
I hope this helps sorry about my handwriting, I know it's ugly. If u want, I can type this and send it again.