In Queens, New York, a young woman was attacked and killed in the courtyard of her apartment complex. Although many of her neighbors were home, could hear her screams, and some could even see the attack, none of them called the police. This BEST illustrates:-

Diffusion of responsibility

Explanation:

Diffusion of responsibility is defined as tendency of people to behave in less  responsible manner in any situation or on-going act due to presence of other people. In such situation, people think that others will take action or responsibility or might have already taken step in that situation .

According to the question, neighbors of the women who was getting killed did see her getting attacked and heard her screams as well but did not take any measure due to diffusion of responsibility. They thought that other people witnessing the attack must have called police as a responsibility.

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i think it's b or c hope this