I think that B is in the active voice.
Answer: Hyperbole
A hyperbole is an exaggeration that is not meant to be taken literally. It is usually used to make a persuasive point or to add emphasis. In this case, "opening a door to eternal tyranny" is an example of an exaggeration of this type. While it is likely that tyranny will not be eternal (the country itself will not be eternal), its purpose is to emphasize the risk of keeping the seat of governent vacant.
Answer:
But for the timely <em><u>arrival/ intervention</u></em> of the law enforcement agencies, there would have been a clash between the two communities.
Explanation:
In the given statement, the idea is that there was a possible clash between the two communities. But this confrontation was evidently thwarted by the enforcement agencies who managed to prevent the scene from unfolding into a huge brawl.
The use of the word <em>"but for the ....."</em> is meant to suggest "if not for ..." It is another way or form of saying "had not the enforcement agencies arrived on time".
Thus, the full statement will be <em>"but for the timely </em><u><em>arrival/ intervention</em></u><em> of the law enforcement agencies, there would have been a clash between the two communities".</em>
Answer:
It's letter C.
Explanation:
Just ask one person so that you will not get confused.