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Which theme is best supported by the descriptive detail in this passage from my antonia

Which of these statements is evaluative in nature a) the short passage creates a brilliant and sketch of gabriel b) resulting from the fact that gabriel is observant, he is also reflective c) the way gabriel looks at his wife shows that he is a detached onlooker d) that gabriel is observant is evident from the minute details he notices

Why did the author include the fact that 40,000 african americans participated in the bus boycott