From the point of vies of this place (i.e. for the people who stayed in the place) this is called emigration: when people leave the country, it's called a mass emigration.
From the point of view of the place where this person settles down, this is called immigration and this person is an immigrant
The Arabs used to kill their daughters by throwing them into a well etc.However,before being a prophet Muhammad(sav) used to carry his daughter on his shoulders.After Islam,Kur'an banned killing of these children.These are 2 simple examples.
Answer:
D. a game in which players act in rational, selfminusinterested ways that leave everyone worse off
Explanation:
The prisoners dilemma involves the idea that both people would act in self interests, but this self interests would not help the other one or the group to have a better outcome, so people is acting in detriment of the society or the other participant, it often happens that both people chose to protect themselves damaging the other person, and thus since both had choosen that option both are worse off after it.