Which of the following should appear in a conclusion?

an introduction an introduction supporting details supporting details reasons and examples reasons and examples a closing idea

a closing idea

In a conclusion, the following elements should typically appear:

1. A restatement of the thesis or main idea: The conclusion should remind the reader of the main point or argument made in the essay or piece of writing.

2. A summary of the main points: The conclusion should briefly summarize the key supporting details, reasons, and examples that were discussed in the body of the writing.

3. A closing idea or final thought: The conclusion should provide a sense of closure and leave the reader with a lasting impression or final reflection on the topic.

Therefore, out of the options provided, "a closing idea" should appear in a conclusion.

In a conclusion, it is important to summarize and reinforce the main points discussed in the body of the text. To determine which of the options should appear in a conclusion, let's examine each choice:

1. Introduction: The introduction is typically found at the beginning of a text and sets the stage for the topic being discussed. It provides context and background information. The introduction is not a part of the conclusion since the conclusion focuses on wrapping up and summarizing the main ideas.

2. Supporting details: Supporting details are evidence, facts, examples, or explanations that help bolster the main points or arguments. While supporting details are crucial for strengthening the body paragraphs, they are not typically included in the conclusion. Instead, the conclusion should provide a concise summary of the main ideas.

3. Reasons and examples: Reasons and examples contribute to the effectiveness of an argument by providing logical justification and concrete illustrations. While they are essential in the body paragraphs, they may not necessarily be repeated in the conclusion. Instead, the conclusion should restate the main points and highlight their significance without repeating all the specific reasons and examples.

4. A closing idea: A closing idea, also known as a concluding statement or final thought, is a crucial component of the conclusion. It should wrap up the entire discussion and leave the reader with a final impression or a call to action. Therefore, a closing idea is expected to appear in the conclusion.

Based on the analysis, the option that should appear in a conclusion is "a closing idea."