Sociologist: The welfare state cannot be successfully implemented because it rests on the assumption that human beings are unselfish -- a seemingly false assumption. The welfare state is feasible only if wage earners are prepared to have their hard-earned funds used to help others in greater need, and that requires an unselfish attitude. But people innately seek their own well-being, especially when the interest of others threaten it. Which one of the following most accurately expresses the main conclusion of the sociologist's argument? ['The welfare state will not work.', 'The interests of the less fortunate impinge on the interests of others.', 'The assumption that human beings are unselfish is false.', 'The welfare state unfairly asks those who work hard to help those in greater need.']