A survey showed that even if the offspring of ordinary people make the same effort as the offspring of successful people, their chances of success are only half of the latter. It can be concluded that success depends mainly on genetic factors. Which one can most refute the above points? ['Offspring of successful people tend to work harder than the offspring of ordinary people.', 'Offspring of many successful people have no success in their careers.', 'Offspring of successful people have a better environment for growth than offspring of ordinary people.', 'Many so-called successful people come from ordinary families.']