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D. because it has no comma and theres multiple places where theres reasons for this is a run on sentence.
active voice is a sentence with an action verb
passive voice is a sentence where the subject is acted upon
therefore, this is a passive voice, because the fire WAS extinguished.
I would agree with you - the conclusion should leave readers with an important thought at the end.
This thought should never be new, or opposing to the previous ideas you had been writing before. It also shouldn't be confusing, but quite conversely - it should explain everything and put everything in place.