One should never sacrifice one' s health in order to acquire money, for without health, happiness is not obtainable. The conclusion of the argument follows logically if which one of the following is assumed? ['Money should be acquired only if its acquisition will not make happiness unobtainable.', 'In order to be happy one must have either money or health.', 'Being wealthy is, under certain conditions, conducive to unhappiness.', 'Health is more conducive to happiness than wealth is.']