Answer:
b. close friends and family.
Step-by-step explanation:
In the given situation it is mentioned that the self-interest does not significant that it is for selfish it involved the individual consideration for the close friends and family. As if we talk about self-interest so it would be considered for the same i.e. close friends and family but not for the strangers
Therefore as per the given situation the option b is correct
And the rest of the options are incorrect