There are three friends–masako, elida, and renata–who notice that one of the boys in their class looks very sad one morning and is holding back tears. each of the girls thinks the others will ask him what is wrong and be supportive and so none of them say a word. this failure to act because they thought others would is called

diffusion of responsibility.

Explanation:

It's an event where there is more than one person included and each of the people think that the other will help and each of them feels less responsibility in the given situation.

It's more likely to happen when there is ambivalent situation, and each person is led by the thought that the other will help and that it isn't their responsibility.

answer is d hope this !

i say that the answer is 'd'