Answer:
Option D => Diffusion of responsibility.
Explanation:
The concept of or term "Diffusion of responsibility'' is an important aspect in Psychology and it deals with individuals are evading responsibilities because other people are there and they push the responsibility to one another.
This concept is a Behavior that appears even from cradle till adult. The concept of Diffusion of responsibility do occur at schools and individual place of work. Diffusion of responsibility do occur because individually we may believe that if we do not do something, the another person will do it instead.
Therefore, the correct option is ''D''. Each of the onlookers will be thinking that if he or she does not help another person will do.