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.
"Both civilizations sprang up in locations with water sources" would be the best option from the list, but it should be noted that this was much more the case with the early River Valley Civilizations.
