The conclusion paragraph is a closing statement. The main problem with the conclusion paragraph of the thesis is that it is missing one of the main points. Thus, option B is accurate.
A thesis statement is a concluding sum up of the introductory paragraph that provides a brief summarization of the whole context. In a paragraph, the thesis statement is followed by the other heading and conclusion.
In the conclusion part of the passage, the main point that highlights the fun of climbing the stairs and getting wet through the Niagra falls is missing.
Therefore, option B. conclusion is missing the main point.
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