The Shift of the Chinese Population to the South Created

The shift of the Chinese population to the south created what major change in Chinese history?

A) It created a population crisis in the south.
B) For the first time in Chinese history, most of its population lived in the south.
C) The south was not able to feed its growing population.
D) A serious population drain affected the Jin dynasty.
E) It put an end to the economic revolution in the south.