C. discusses the importance or implications of the main points in the essay
The conclusion is evaluative, that means that you are going for give the conclusion based on your own opinions about the particular subject. You are going by evaluate the good sides, or the bad ones, or decide whether and not the main points within the essay have been expounded upon of enough details.
Evaluation, when done by the expert and any authority on the subject has great value or significance for others as it provides the necessary feedback about the object that can be useful for others. Evaluation has the judgmental part in this or serves the purpose of an appraisal of the scheme.
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