Regarding question 21, I chose letter B as my first option because, as it is a factual question where we have to look for the information in the text and do like a “copy and paste”, I might misread the phrase "not rich or detailed enough..." which made me think the teachers were failing to provide detailed descriptions of reflections methods. So, I assumed that it was something teachers failed to do. However, after rereading the paragraph and thinking carefully about the rest of the answers, I realized it was letter C. As I identified the word “events” and read the complete key sentence that teachers tend to "evaluate events rather than review the contributory factors in a considered manner…” which means they were not thinking deeply about the causes of what happened in their classes. It was something teachers fail to do according to text. For this reason, I changed my opinion as letter C directly reflects the main idea of the paragraph and answers the question.