Answer: B. Asia and Africa
Explanation: According to the graph shown, it can be concluded that the rapid increase in the population in urban areas is in constant growth in Asia. Also, there was an increase in Africa, which was from the 1950's to the 1990's that was below the population growth in America, and then, in the 90's, it was the same, and then higher than the population growth in America. Since 2010, this increase has been higher in Africa and has been steadily improving, showing that according to predictions by 2050, the biggest increase will be in Asia and Africa. In Europe, for example, this increase is more or less the same.
