When- latest period of the stone age which was right after the ice age
10000 B.C. to 4000 B.C.
Where- Mesopotamia in what is now modern Iraq
This scenario of Roger being beaten up and not one of the 15 people actually helping Roger perfectly illustrates that which is called the diffusion of responsibility. This is a sociopsychological phenomenon that occurs when there is a group of people and it means that the person is less likely to help and take responsibility or irresponsibility, either one, when other people are present.
It is a person who study it!
The answer is A. Enforcing Immigration Laws.
The rest are something that the U.S. Congress have power over.