I believe B is the answer..
Answer:
The 1918 flu claimed an unfathomable 50 to 100 million victims worldwide, including an estimated 675,000 Americans
Explanation:
A rise in society's population that is concentrated primarily in major cities is known as Urbanization.
Urbanization may occur both from the population shift from rural to urban residency as well as by population growth within the cities and can be understood as the the gradual increase in the proportion of people living in urban areas as opposed to rural areas.
When the Japanese empire was dismantled at the end of World War Two, Korea fell victim to the Cold War. It was divided into two spheres of influence along the 38th parallel. The Americans controlled south of the line - the Russians installed a communist regime in the north, later ceding influence to China.