A recent research institute has made a large number of investigations and found that people from the upper classes of famous families are 50% more likely to succeed than people of ordinary origin. Therefore, the quality of people is mainly determined by genetics. Which of the following, if true, would most weaken the conclusion? ["Long Shenglong, Feng Shengfeng, the rat's son will punch holes.", 'Famous families in history often start at the end.', 'There are no three generations in the family, and no prominent family can escape the historical law of reincarnation.', 'Human success is largely related to external environmental factors such as acquired educational opportunities.']