Answer: C) It is a dependent clause.
Explanation: an independent clause is a sentence that has complete meaning on its own (it has at least a subject, a verb and all the necessary complements), a dependent clause is the contrary, is a phrase that, in order to make sense, it needs to be with an independent clause. The given excerpt is a clear example of a dependent clause, because as we can see, it doesn't have complete sense, we can tell that it is missing something.
Answer:
He uses terminology to communicate complex concepts.
After Caesar's murder, the plebeian demand an explanation. Brutus rises to the pulpit and silence is done to hear him. In short prayer, he explains that he killed Caesar to avoid people become slaves. He claims that he killed Caesar, not because he didn't love him, but he loved Rome more. However, after Mark Antony's speech about Caesar's will, the silent crowd puts itself in growing fury.
The answer is D. Who; subject. Hope this helped!