Which perspective best explains the bystander effect whereby individuals will be less likely to someone in need because of the presence of others close by?

The perspective which best explain this is SOCIO-CULTURAL PERSPECTIVE.
Socio-cultural perspective is a theory which explains the awareness of situations surrounding people and how their behavior is determined by their environment, culture and social values.

No it doesnt because it can be any number.

Ithink the answer would be a