These lines from Kennedys 1963 Civil Rights Address seek to most clearly define which idea?

I have encountered this question before and I think these are the lines that you mean "One hundred years of delay have passed since President Lincoln freed the slaves, yet their heirs, their grandsons, are not fully free. They are not yet free from the bonds of injustice; they are not yet free from social and economic oppression. And this nation for all its hopes and all its boasts will not be fully free until all its citizens are free." These are the choices from the question.

A. injustice B. economics C. freedom D. nationality

The correct answer among the choices provided is option C.