At first, when answering question 21, I chose option B (Provide sufficiently detailed descriptions of the methods they used to help them reflect), focusing on the phrase “not rich or detailed enough,” which I thought referred to the teachers’ descriptions of their reflection methods. However, upon rereading the paragraph, I realized that this phrase referred to the depth of their thinking rather than their descriptions. In fact, the paragraph explains that teachers tended to evaluate events instead of thoughtfully reviewing the contributory factors. Therefore, the correct answer is option C (Examine thoughtfully the possible causes of events in their classrooms), as it highlights the teachers’ failure to examine the possible causes of classroom events in a reflective and objective manner.