A researcher studied the make-up photos of 100 deceased athletes and divided them into three types based on facial expressions in the photos: "faceless", "toothy" and "laughing". The researchers found this Of the 100 deceased athletes, the average life expectancy of "faceless" people was 72.9 years, the "toothy smile" people could live to about 75 years, and the "laughing" people averaged 79.9 years Therefore, the researcher believes that the attitude towards life will affect people's life expectancy. Which of the following, if true, would most question the researcher's point of view? ['The 100 athletes have different nationalities and different sports.', "The expression on the makeup photo can roughly reflect a person's attitude towards life.", "Which expressions the athlete takes depends on the photographer's requirements.", '"Laughing" athletes are more communicative and have higher emotional intelligence.']