What statement does the author make to emphasize that graffiti art is considered vandalism?
a. one style is called “wildstyle”—it is calligraphy-like writing with interlocking letters.

b. in my opinion, we should give more support to graffiti artists and take the time to listen to what they are trying to tell us through their amazing images.

c. technically, even the most beautiful piece of graffiti art must be removed according to most city laws, and it is taxpayers who end up paying the bill.

d. it is hard to know what the future of graffiti art will be.

C. Technically, even the most beautiful piece of graffiti art must be removed according to most city laws, and it is taxpayers who end up paying the bill.

Explanation:

This statement acknowledges that graffiti is illegal and therefore vandalism.

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.  

i also think it is d (sorry if it's not)