multiple-choice question\nwhy should you explain the basic information about\nyour topic in your…

Brief Explanations:

The purpose of explaining basic topic information in an introduction is to provide readers with necessary background knowledge to understand the content, not to unnecessarily lengthen the text. The option "To make it longer" is incorrect as writing should be concise and purposeful. The correct reason is to give the reader background knowledge.

Answer:

B. So the reader has background knowledge. (Note: Assuming the second option is labeled B; if the first was A and second B, the correct is B. If the options had different labels, adjust accordingly, but based on the content, the correct option is the one stating "So the reader has background knowledge".)