Which of the following scenarios illustrates what might have taken place at a southern state polling center in the wake of the ratification of the fifteenth amendment?

It seem like there are information missing on the question posted. Let me answer this question with all I know. So here is what I believe the answer is, rallies are made everywhere.

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Structural mobility

Explanation:

In simple words, Whenever societal developments allow a large number of individuals to migrate upward or bottom the economic class hierarchy, this is known as structural movement. Individual improvements are not responsible for structural mobility; rather, it is due to developments in community as a whole.

Thus, from the above we can conclude that the correct answer is structural mobility.