Answer:
It likely made them recognize their own hypocrisy in celebrating the holiday.
Step-by-step explanation:
Frederick Douglass' Fourth of July speech was given on the 5th of July 1852 was an excruciatingly honest take on the celebration of the American independence day despite most of the black Africans still racially prejudiced. And it is through this speech that he presents the sort of 'celebration' that his people are being subjected to.
And in presenting a contrasting view of the American independence day of Fourth of July, it is likely that the 'white' Americans will recognize their own hypocrisy in their celebration of the national holiday. Thus, the correct answer is the second option.