[单项选择]In the two decades between 1910 and 1930, over ten percent of the Black population of the United States left the South, where the majority of the Black population had been located, and migrated to northern states, with the largest number moving, it is claimed, between 1016 and 1918. It has been frequently assumed, but not proved, that most of the migrants in what has come to be called the Great Migration came from rural areas and were motivated by two concurrent factors: the collapse of cotton industry following boll weevil infestation, which began in 1898, and increased demand in the North for labor following the cessation of European immigration caused by the outbreak of the First World War in 1914. This assumption has led to the conclusion that the migrants’ subsequent lack of economic mobility in the North is tied to rural background, a background that implies unfamiliarity with urban living and a lack of industrial skills.
But the question of who actually left the South has n
A. people who migrate from rural areas to large cities usually do so for economic reasons.
B. most people who leave rural areas to work in cities return to rural areas as soon as it is financially possible for them to do so.
C. people with rural backgrounds are less likely to succeed economically in cities than those with urban backgrounds.
D. most people who were once skilled workers are not willing to work as unskilled workers.