The phrase in the text, ‘human beings are self-interested, not selfish’ means th

The phrase in the text, ‘human beings are self-interested, not selfish’ means that:
a. people are never selfish
b. people never act in a spiteful or belligerent manner.
c. people never act in a fit of rage
d. people contribute to charities and they help others
e. people care only about themselves and their families