"although the sun was shining, it wasn't that warm" is the correct answer because it contains a main clause (it wasn't that warm) and a prepositional phrase (although the sun was shining,). Hope this helps :)
I think the subordinate clause is "that chewed up my new shoes"
the literal meaning is "you're not black if you don't act black" they are basically saying that black people are sloppy and eat with their hands (not true) but the deeper meaning is that the food they are eating was probably here by slaves, as mentioned "in the south"
They were very clean people who smelled good :D
