A comma i think thats what it is
A main idea is the central idea which a story is centered on and which the <em>author </em>wants the reader to learn or take away from.
With this in mind, a supporting detail is used to validate a claim to prove that a claim is indeed factual and can be verified.
For example, bringing statistical data to prove that for example, blacks have the <em>most population</em> in America to support a claim which states that.
Without bringing accurate data or information to validate the claim, the claim would be <em>unverified</em>. This shows that supporting details are very important when making use of argumentative essays or when a person is trying to persuade or convince.
Please note that your question is incomplete so I gave you a general overview to help you
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The sentence that Nancy should add at the beginning of the second paragraph to serve as the most effective position statement for her essay is <em>C. We spend way too much time during the week ...</em>
- A position statement is the writer's or speaker's viewpoint, claim, or thesis clearly stated after the introductory paragraph. It may also come at the end of the first paragraph or sometimes at the beginning of the second paragraph.
- It clearly states the unequivocal position that the author has taken on the topic. It is then interwoven with reasons and evidence to support the stated position.
- The major characteristics of a position statement are:
- It is simple and clear.
- It is memorable and tailored to achieve result.
- It is credible, focused, and supported with reasons.
Thus, a position statement does not create ambivalence and ambiguity like options A, B, and D but is well-supported with reasons like option C.
Related link at brainly.com/question/17258381