Answer: #1, Dr. King alludes to the horrors of bandage and enslavement.
Explanation: #2 explanation may have been correct, if the speech paragraph had mentioned anything about Lincoln's freeing of enslaved people. #3 and 4 are not mentioned by word at all, directed towards other aspects of America. Thus, #1 is the answer, talking about in the article how he alludes to the horrors of bondage and enslavement.