Moralist: Humans have a natural disposition to altruism -- that is, to behavior that serves the needs of others regardless of one' s own needs -- but that very disposition prevents some acts of altruism from counting as moral. Reason plays an essential role in any moral behavior. Only behavior that is intended to be in accordance with a formal set of rules, or moral code, can be considered moral behavior. Which one of the following most accurately states the main conclusion of the moralist's argument? ['All moral behavior is motivated by altruism.', 'Altruism develops through the use of reason.', 'Behavior must serve the needs of others in order to be moral behavior.', 'Not all altruistic acts are moral behavior.']