Explanation:
parallelism means that the same from of words is used in the entire group of words.
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Answer:
An essay is an explanation on a "specific topic". It consists of three parts:
=> Introduction (1 paragraph)
=> Body (2 or more paragraphs)
=> Conclusion (1 paragraph)
To write an essay, we'll first introduce the topic. After moving to the body, we have to explain the topic in a detail. After we are done with the body, we conclude the topic.
The answer is C. Tropical.