Which of these statements is true according to the graph? a) by 1900 the majority of the u. s. population lived in urban areas. b) in 1810, less than 90% of the u. s. population lived in rural areas. c) rural and urban populations in the united states were roughly equal in 1920. d) between 1940 and 1960 there was a steady increase in the u. s.'s rural population.