In the early 20th century, the primary <span>cause of the large-scale migration of African
Americans out of the rural South was "</span><span>(2) opportunities for jobs in northern factories" and better treatment by whites, in general. </span>
This was granted by an initiative.
Why does it say incorrect
I would say no. The League of Nations although had enjoyed limited success, was a failure because of the selfishness displayed by the European powers. The Treaty of Versailles lacked practicality and ultimately failed at 'addressing the causes of conflict and restoring peace and normality', because there was a World War II.
The answer you’re looking for is B