The purpose of the compare and contrast essay is to explain or illustrate one main idea in each topical paragraph. Thus first option is correct.
A compare and contrast essay compares and contrasts two or more topics (such as people, objects, or ideas) by pointing out their similarities and differences.
There is the option of concentrating solely on comparing, solely on contrasting, or on both; alternatively, your instructor may give you instructions to perform one or both.
The purpose of color-coding detail sentences in a compare-and-contrast essay is to explain or illustrate one main idea in each topical paragraph.
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