Why does lincoln use the first-person plural mode of address ? a ) because he is speaking to a large group of people b ) to create a feeling that everyone in attendance aligned and united c ) because he wants to empathize who is responsible for the desperate state of the nation d ) because he wants to inspire his audience and motivate them to take action

The answer to your question is,

B) To create a feeling that everyone in attendance aligned and united.

-Mabel <3

c. to depict the cunningness of the federal soldiers

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.