The author says that the film failed to reject the idea that African Americans are not quite Americans, so the protections of citizenship should be elusive to almost all African Americans. The second blank should match the idea of exclusion of a group and prejudice, only displacement and disenfranchisement follow that logic. The author is more interested in raising the issue of citizenship, so disenfranchisement is the better choice. The main topic of discussion is African Americans, so central is the best choice.
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There is nothing in the question that implies disenfranchisement..

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disenfranchisement means not being part of the society, country, culture etc, in fact of something one ought to belong to. Ex: Women voters felt disenfranchised in the democratic process until they earned the right to vote.

In the second blank, only disenfranchisement fits

Lee's film fails to dispel the notion that African Americans are not quite American."These United States of America", referred to in the film's dedication, thus emerge as a deeply
troubled site in which the relative protections of national citizenship remain (i) ___ all but a privileged few. The long history of African American (ii)___ — placing a large proportion on race and class prejudice—means that America's black population plays a (iii)___ role in illuminating the national drama of exclusion.


The first statement clearly expresses a disappointment on right/notions so elusive fits here (both feasible and accessible are opposites).

The words following - clearly elaborates more on the blank part, so disenfranchisement (not equal rights) fits here.

The third blank is the easiest since central is the only possible option.

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