(HC)The graph below compares the size of the urban and rural population in the United States during the first four decades of the 20th century: The graph is a combination line graph, top, and bar graph, bottom. The line graph expresses percentage. The bar graph expresses total numbers. The vertical axis is population in millions from 0 to 200 on the left and percentage from 0 to 80 on the right. The horizontal axis is the years from 1900 to 1930 in ten year increments. The red line representing rural population slopes downward from 1900 to 1930. The blue line slants upward for the same period. The bars do not have the same opposite relation. © 2012 U. S. Global Change Research Program http://www. usgcrp. gov Which statement about the period from 1900 to 1930 is true, based on interpretation of both sections of the graph? A: While the population of people living in rural areas increased, the percentage of people living in urban areas decreased. B: While the percentage of people living in rural areas declined, the population in rural areas increased. C: While the population of people living in urban areas increased, the percentage of people in urban areas declined. D: While the percentage of people living in urban areas decreased, the population of people living in urban areas increased.