Answer: The answer is C.
Explanation:
State Exam= Object
Was Passed= Action/ Verb
The Students= Subject
The passive voice is used to show interest in the person or object that experiences an action rather than the person or object that performs it.
C is the right one. Unlike quotations or paraphrased ideas, information that's considered "common knowledge" doesn't need to be cited. "Common knowledge" is information that's considered widely known or easily verified.
There was a burst of activity when the sound of the alarm propelled the fire department into action.