to identify the central idea of a text, readers must
NOT C

Answer:
Notice key words and details
Explanation:
The central idea of a text refers to the most important thought that a text has about a topic; this idea tells the readers what the text is about. It is also usually defined as a short and general summary of the piece of writing, and in order to identify it, we first have to understand the content and we must pay attention to the topic of the text, the keywords, the details, and the ideas that are repeated.