Answer
3 Still not free
Explanation
The phrase still not free is referring back to the word captivity telling us that captivity is the opposite of being free; telling us that the negro is still encage in a cage of oppression and discrimination.
We can rule out option 1 because joyous daybreak has a positive connotation, whereas captivity has a negative one.
We can rule out option 2 because one hundred years is just pointing out a period time not the circumstances of it.
We can rule out option 3 because sadly crippled is telling us how the negro is not where it is.
We can conclude that phrase from the text provides the best context clue to determine the meaning of "captivity" is still not free.