Answer:
B. a personal story to convey his key points about reward versus risk.
C. questions to help explain his attitude about reward versus risk
Step-by-step explanation:
In this section, the author wants to stress how difficult it might be to change course, even facing strong proof that a change is necessary when we have invested a lot on a specific path mean to lead to the desired goal. In order to stress the importance of that idea, the author provides a personal example (his reluctance to move the ladder despite the certain risk) and questions meant to interpellate the reader about the subject.