Throughout paragraph 14, Dr. King mostly supports his argument for immediate action by — F using logical appeal

G using emotional appeal

H establishing his authority

J establishing his credibility

J he used his credibility.

J and I don't know why :

the sentence that avoid faulty coordination is:

culture, which is well represented in philadelphia, plays a major role including theatre, music, and the visual arts.  

faulty coordination occurs when the writer gives equal importance two different ideas (clauses) which in fact are not equivalent. in order to correct a misplaced clause or idea, the writer can place less important or emphatic ideas in a relative clause as in the previous sentence.