The information given in the map shows the how culture can spread by migration, trade, and conquest. Thus the option (C) is correct.
Britishers were the European traders who came from the Britain to do trade in different parts of the world. as the trading was developed in different parts of the country they started to undertake political powers from the foreign countries.
As the British empire grow in the different parts of the world the culture also spread. They started spreading their culture that is westernization of the clothing, spread of the Christianity and usage of the English language.
They setup various schools and imparted English language in it. Thus this is how the culture can spread by migration, trade and conquest. Thus the option (C) is correct.
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