The correct answer should be target market.
It would be bad business for them if they didn't know their target market because they could establish soccer academies at places where nobody plays soccer. If they know what the people want they can give them that and everyone is happy then.
The use of physical restraint by a police officer when dealing with a member of the public is called police use of force
Nationality is basically restricted to the constitute states (England, Wales, Northern Ireland, Scotland) and can also include a common, British nationality. It is more determined by where someone was born and raised.
Ethnicity can encompass background from other continents: for example, British English, Jamaican English - Ethnicity reflects people's family backgrounds
China instituted a one-child policy in 1979 because the government recognized that the population in the country is rapidly growing. The One Child Policy is their only solution to decrease the population growth in order to avoid getting stuck in more social and economical problems in the future brought by overpopulation.
