I think that the answer is A
The answer for your question is the letter A.
Answer: The Push-Pull Factors are those that drive people away from a place and draw people to a new location.
These factors can determine migration or immigration of particular populations. It can be conflict, drought, famine, or extreme religious activity. Poor economic activity and lack of job opportunities.
Push factors are the forceful, demanding that makes a person or group of people leave one country for another.
Pull factors are the positive aspects of a different country that can encourage people to immigrate waiting for a better life.
The force driving behind European Imperialism in Africa was when the Europeans took advantage of advances in technology to enhance their ability to acquire resources from Africa.
The company towns reinforced it by having special wages for people of different ethnicity or by racially profiling and segregating those that they didn't want to be equal with Caucasian workers. This caused an even bigger drift between people and distrust to arise.
