Which is the most effective way to vary the
sentence patterns in the passage?
a. lengthen sentence 5.
b. combine sentences 3 and 4.
c. start sentences with different parts
of speech.
d. invert most of the sentences.
an

I'm pretty sure that the answer is D. Either D or C, but probably 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.  

first aid for seizures is aimed at keeping the person safe until the seizure stops on its own. stay calm, loosen anything around the person's neck, do not restrain them or put anything in their mouth, clear the area around them, and stay with them after the seizure stops.

hope this !