In a previous TOEFL reading practice, I mistakenly chose option B for Question 21, thinking it best matched the text. Option C mentions “thoughtfully examine the possible causes,” which directly reflects the phrase in the passage: “review the contributory factors in a considered manner.” My initial mistake was both misreading and misinterpreting a key detail specifically, the phrase “not rich or detailed enough.” I assumed this referred to a lack of description about teaching methods, but in reality, it meant their understanding of classroom events lacked depth for effective reflection. This experience showed me how important it is to focus on the exact meaning of words in factual information questions.