Answer:
D is the closest to an antonym!
I believe it was the Chinese, because at that time southeastern China had a poor economy.
<span>As for many Americans, the Second World War boosted the economic prospects of many African Americans. In particular, war industries created a demand for labor, which many black workers, including black women, were able to fill. Thousands of African Americans moved north to industrial centers, but also to places like California, which saw tremendous population growth during the war due to the war industries that developed there.</span>