By population, Lagos, Nigeria.
Answer:
a person or thing that is popular or fashionable especially among a particular section of society
Explanation:
According to the Canadian Museum of History, one of the primary ways geography affected early civilizations was in determining the location of settlements. Since early humans needed access to water and fertile ground for agriculture, cities tended to spring up along rivers and flood plains. In addition, geographic features such as mountains frequently served as barriers and provided natural borders between civilizations.
I think you forgot to add the diagram along with the question. I am answering the question based on my research and knowledge. "Effects of Open Door Trade" is the one title among the following choices given in the question that best completes the diagram. I hope the answer has come to your desired help.