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.
Hello there, The reason is because, it was one day after the Empire of Japan's attack on the US naval<span> base at Pearl Harbor </span> Hope this helps :))
