Final answer:
If the widespread acceptance of egoism would make everyone better off, it would support ethical egoism.
Step-by-step explanation:
The question is asking whether the widespread acceptance of egoism would support or refute ethical egoism.
Ethical egoism is the view that individuals should always act in their own self-interest.
If everyone being better off is a result of egoism, it would be a strong moral consideration in favor of ethical egoism (option A).