The purpose of a summary is to restate a text's most important information.
The correct option is "to restate a text's most important information." A summary is a concise and condensed version of a longer text, article, or document. Its purpose is to capture and convey the main points, essential details, and the overall message of the original text. Summaries are useful in providing readers with a quick overview of the content, allowing them to grasp the key ideas without having to read the entire text.