Egoism Is an Ethical Principle Which Aims to Promote What

Egoism is an ethical principle which aims to promote what value more than any other?

A) When faced with a decision about how to behave, a person will and should do what is in their own best interest
B) When faced with a decision about how to behave, a person will and should do what is in best for the community overall and not loom at their own best interest
C) When faced with a decision about how to behave, a person will and should do what is in the 'right' thing to do because it is the 'right' thing to do
D) When faced with a decision about how to behave, a person will and should do what is the most virtuous choice, irrespective of self interest