Which of the Following Is an Example of Imperialism

Which of the following is an example of imperialism?

A) The Peruvians expanded control of surrounding regions by requiring these communities to provide the government with certain resources as tribute.
B) The Greeks created port settlements overseas and exerted control over trade within these regions.
C) The Spanish created missions in the New World and required native populations to live and work at these religious centers.
D) Early American settlers took over Native American lands and claimed them as their own.