Lets go down the line, It could be a so we'll keep that in mind.
Cant be B unless the President hires a more diverse set of press secretaries, so thats a no as the current is Sarah Sanders.
Cant be C as both men are white, and the iraq war has nothing to do with minority rights nor does the fact kerry lost. So C is no.
And D is an absolute no, JFKs death postponed Civil rights if anything, and his assasin was lee harvey oswald a white self described communist, so D is no.
Only option is A, seeing as Obama was the first black president, and none of the other options make any sense.