How does this reasoning appeal to the shared beliefs of King’s audience?
“Just as the prophets… so am I
compelled to carry the gospel of
freedom beyond my own
hometown.”

Martin Luther King's 'Letter From Birmingham Jail' primarily aims to convince the listeners to 'break the unfair and unjust laws.' To substantiate his claim, he uses various reasoning appeals which makes his idea more effective. The description 'Just...own hometown' highlights the morality of his cause of protesting and emphasizes his message that 'it is the moral responsibility to stand against the unjust laws and take necessary actions against them as he feels 'injustice anywhere is a threat to justice everywhere.'  

i would have to say "a" or "d".