Wife: I heard that eating fish can make people smart. Husband: How is this possible? Mr. Lu Xun is not a fan of fish because eatting fish takes too much time. Nie Weiping prefers fish head, but if he only eats fish heads for three meals a day, he will never be such smart on the chessboard. The husband's rebuttal actually questioned which of the following assertions? ["If you don't eat fish, you won't be smart.", 'It is not only eating fish that makes you smart.', 'If anyone eats fish, he can be smart.', 'Only eat fish or eat fish alone, people will be smart.']