The likely answer is D. It is the most effective
Shakespeare, who was born in Stratford, wrote Hamlet.
Answer: Capture your key points and comment on their significance
Explanation:
Since the person is working on your conclusion, but you're having trouble challenging your readers, the strategies that will help you with that is to capture the key points and comment on their significance.
By capturing the key points, the important aspect of the story will be highlighted and their significance will be commented on. Therefore, the correct option is A.