The correct answer is C. Hope that helps :)
Answer: C is the answer.
Explanation: why its C because it is saying, A word or phrase for one thing that is used to refer to another thing in order to show or suggest that they are similar 2.
1. address your letter to the person
2. quickly get to the point
2. state what they could do about it
3. support it with other things
4. give them a time limit
5. finish it respectfully
and yeah i think that's it XD