What are the immigration tides in the history of China?

"Going to Kanto, Going to the West and Going to Nanyang" can be called three great migration waves in China's modern history. These three migrations were forced by a large number of poor people. In the Jin Dynasty, Hakkas moved south, that is to say, Han officials from the Central Plains, mainly from Henan Province, moved south during the war and began to become a "special identity" resident group. Later, in several migration actions, the unique Hakka family was gradually formed today.

So choose: C.