For Ren to determine the text structure of the passage, he should ask this question:
Text structure refers to the manner in which a text is organized. Examples include; sequence, chronology, time, proposition and support, investigation, description, etc.
So when Ren reads the text, he can determine if it follows a compare and contrast structure by asking the question in option C.
Learn more about text structure here:
https://brainly.com/question/12053427
#SPJ1