Select whether the sentence below is a simple, compound, complex or compound-complex sentence. However, when David came to conquer the city with his army, he discovered that the Jebusites got their drinking water from a spring just outside the city walls.
a.
Simple
c.
Compound-Complex
b.
Compound
d.
Complex

I use to be a master at this but I don't know now but I THINK it's C I don't know

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.  

the correct answer is the following.

one of the groups i belong to is the boy scouts. this is a problem-solving group because it has tasks that we need to solve in order to other people in different activities such as the rescue of lost pets, or elder people in need.

the other group i belong to is kids pro environment, and is an information-sharing group that tries to create conscience about the risks and problems that generate pollution in our cities. we share information to other students and parents on the importance of keep our communities clean and our skies clear.