We are currently reading this in class as well.
Forgive me if I'm wrong, but I believe that the answer is, "They see Dr. Mengele deciding who will live and who will die."
Second person is a point of view (how a story is told) where the narrator tells the story to another character using the word 'you. ' The author could be talking to the audience, which we could tell by the use of 'you,' 'you're,' and 'your.
Answer:
B, "They keep leaving acorns all over everyone's windshields..."
Explanation: