Scientist: Some pundits claim that the public is afraid of scientists. This isn' t true. I have been a scientist for several decades, and I have never met anyone who is afraid of scientists. Which one of the following is an assumption required by the scientist's argument? ['If the public were afraid of scientists, then over several decades a scientist would encounter at least one person who was afraid of scientists.', 'If a person understood what science is really about, then that person would not be afraid of scientists.', 'Alleged scientific claims may be used to manipulate people, and it is understandable that people would be on their guard against such manipulation.', 'People may be apprehensive about technological developments that result from science even if they are not afraid of scientists themselves.']