What is the main difference between farming in the Appalachian Plateau and the Appalachian Valley A. Farming the Appalachian Plateau is more productive because of its rich volcanic soil. B. Farming the Appalachian Plateau is not as good as farming in the Appalachian Valley because of sandy soil. C. Farmers in the Appalachian Valley produce more because they have more freshwater resources than farmers in the Appalachian Plateau. D. Farming in the Appalachian Plateau is not as good as the Appalachian Valley because its climate is too dry.

a question like this requires the excerpt to be included in order to answer the question.

i think the answer is d.

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.