In the letter, King, mentions how Socrates made people think by creating tension in the mind, and how he wants to do the same so that in a non violent way, people would become a better version of themselves (not racist) and would therefore come together as a brotherhood. Taking into account these ideas, the correct answer would be option B: "The strain among opposing groups in Birmingham was similar to the creative blockades in ancient Athens, to which Socrates referred". Option A is incorrect because Socrates and King were not seeking the same goal. Option C is incorrect because King never mentions city officials or that Socrates petitioned Greek city-states and finally option D is incorrect because King never mentions that Socrates was trying to achieve harmony between warring groups.
The correct answers are A and B. They refer to setting up a home, that is becoming mature so as to create your own home. The other choices simply do not reflect an idea of becoming independent or maturing in any other way.