One thing I have noticed about the bio section is there is usually a point or 'significance' that is trying to be conveyed in the question. When reading the question and the answers (if at this point it's not a straight forward question) try to look and see what possible answer is conveying a key point or significance to the question, especially if you come across a question where it looks like there may be more than one possible answer. When they say 'pick the best answer', it means pick one where some key point is being made. Hopefully that made some sense.