Answer:
The second one: You are, if I'm not mistaken, a good person for this experiment.
Explanation:
The first sentence, "You are, if I'm not mistaken a good person, for this experiment." does not have a comma after "mistaken", where there should be one. After "a good person", there should not be a comma.
Answer:
Well, if your list contains:
A. A group of friends hang out and go to the movies.
B. Hikers get caught in a snow storm and must find shelter.
C. Stranded on a boat, a man must fish to survive.
D. The main character builds sandcastles.
Then, the answer would be B).
Explanation:
Hikers get caught in a snowstorm and must find shelter.
Things that can cause people to "grow up" are often seen as traumatic but, can be the exact opposite; inspiring the person or "opening their eyes".