Answer:
The sentence that is an example of a paradox is the following one: She tried to quiet the silence (D).
Explanation:
Paradox means "contrary to expectations or existing belief". It is a statement which appears to be silly or self-contradictory. In this case, the sentence suggests that there already is silence in the room since she is trying to quiet it. Yet silence is already quiet, so what does she need to quiet it? If silence is not quiet, then there is noise. Still, the sentence states that there is silence in the room. What this paradox seems to suggest is that the room is not silent enough.
First person pointer view is the answer
Basically, it's similar to "the student becomes the teacher". One day, you'll start out learning how to write essays, and in the future, you might teach others how to do it. It means that the more you learn and experience, the more knowledge you'll be able to pass onto someone else.
You could write an essay that argues that the more you learn and experience, the more you'll have to teach, and include examples of people who contributed to accomplishments in history and that they too began as a "learner" and not the teacher or the master they're considered.