In an increasingly developed society, obesity has become an annoying "social disease". Women love to be slim, men love to be chic, and bloated bodies, especially those with a big belly, can be very painful. In this case, looking for the cause of obesity and exploring the recipe for weight loss has become a "social trend". Recently, a social institution announced the results of a long-term social survey, which showed that in the 13 years after marriage, women have grown on average At 13 kilograms, men gained an average of 20 kilograms. The agency concluded that marriage can make people fat. Which of the following, if true, is most likely to challenge the above conclusion? ['If the survey time is 3 or 31 years, the weight of the surveyed person will be much smaller than the above increase.', 'In the 13 years after marriage, some of the men surveyed gained less than 20 kg in weight.', 'Singles of the same age as those surveyed, women have grown an average of 16 kg in 13 years and men have grown an average of 25 kg.', 'During the 13 years after marriage, some of the men surveyed had lost significant weight.']