Summarizing requires...

Summarizing involves distilling the main ideas and key points of a text into a more concise form, which is precisely what option B outlines. When you summarize, you articulate the essence of the original content using your own words, which demonstrates comprehension and allows you to convey the core message without unnecessary detail. This process not only helps reinforce your understanding of the material but also makes it accessible for sharing with others.

The other options do not accurately reflect the essence of summarizing. Revising the entire text implies extensive rewriting (option A), which is beyond the scope of a summary. Interpreting the text for others (option C) suggests adding personal insights or analysis, rather than a straightforward summarization. Lastly, memorizing information (option D) does not involve rephrasing or distilling the text, as it focuses on retention rather than comprehension and articulation of the main ideas. Thus, the act of summarizing is best represented by the requirement of playing back all major points in your own words.