An effective summary is characterized by (5 points)group of answer choicesan explanation of the reader's personal opinionrepetition of words from the original textinclusion of only the most important detailsa listing of the facts from the original text

Inclusion of only the most important details are included in the effective summary.

Option C.

Explanation:

Summary is the short form of the original text which only consists of the most essential points of the original text. It  should tell the crust of the text for which the summary is to be written.

It is very important that the summary of the text is very efficient. For the summary to be efficient, the most important details should be the part of the summary. It should have the summary to communicate the main ideas of the text. The essential facts which are very important only that should be a part of the summary and not any other fact.

its specific purpose is to sell a product to people .

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