A: "Eating fish can make people smart. " B: "Yes, I didn't like to eat fish since I was a child, so I was stupid. In order for B's argument to be valid, which of the following must be added as a prerequisite? ['People who do n’t like fish must be stupid.', 'Smart people must love fish.', 'Stupid people must not eat fish.', 'Fish lovers must be smart.']