The correct answer is C. Copying sentences word-for-word
Explanation:
In writing, a summary refers to a brief or concise account of the ideas presented in a text which is written with the purpose of including the most important details in the words of the person that writes the summary rather than in the words of the original author, because of this the original author needs to be credited without quoting it and only important details should be included which is difficult for some writers. Indeed one of the most common mistakes in summarizes include trying to include all the details and not only the most important ones and copying ideas in the way these are in the original text rather than stating these ideas in own words. Therefore, the statement that expresses a common mistake of people when writing a summary is "copying sentences word-for-word".
