It is said that people should accept themselves as they are instead of being dissatisfied with their own abilities. But this is clearly a bad principle if the goal is a society whose citizens are genuinely happy, for no one can be genuinely happy if he or she is not pursuing personal excellence and is unwilling to undergo personal change of any kind. Which one of the following is an assumption required by the argument? ['People are justified in feeling content with themselves when they have achieved some degree of personal excellence.', 'People who are not dissatisfied with themselves are less likely than others to pursue personal excellence.', 'Happiness is not genuine unless it is based on something that is painful to obtain.', 'Those who are willing to change will probably find genuine happiness.']