Human beings can live happily only in a society where love and friendship are the primary motives for actions. Yet economic needs can be satisfied in the absence of this condition, as, for example, in a merchant society where only economic utility motivates action. It is obvious then that human beings __. Which one of the following most logically completes the argument? ['can satisfy their basic economic needs without obtaining happiness', 'cannot satisfy economic needs by means of interactions with family members and close friends', 'can live happily only when economic utility is not a motivator in their society', 'cannot really be said to have satisfied their economic needs unless they are happy']