Final answer:
The statement differentiating between psychological egoism and ethical egoism is true; psychological egoism is descriptive, while ethical egoism is normative in that it prescribes how individuals should act.option a.
Step-by-step explanation:
The statement "Psychological egoism is a descriptive claim that the individual has but one aim: his or her own welfare; ethical egoism is a normative claim that the individual ought to maximize self-interest" is true. Psychological egoism posits that individuals are motivated solely by self-interest, even when their actions appear altruistic. Ethical egoism, on the other hand, prescribes that individuals ought to act in their own self-interest. This could either be in a strong ethical egoism form, which insists it's always right to seek one's own good, or a weak ethical egoism form, which allows for the pursuit of self-interest without making it an absolute obligation.