B. it conveys the subject of the paragraph.
A topic sentence is the main idea which is the subject of the paragraph.
The pronoun that complete the elliptical cause is "I" because sentence uses the word "My" in the very beginning of the sentence so that person is either talking for themselves or someone else, if for someone else than a name would be in The list of answers.
It would be too obvious for me to write the entire letter for you, but I'll include a list of points that you could include in your own writing style:
* Thanking Lee for his letter, and saying that you are happy that he is having a good time.
* Telling him roughly what you're studying at school (without being boring).
* Write about what you would like to do when you leave school.
* Finally, say that you miss him a lot and look forward to hearing from him soon.
Answer:
The purpose of the Receiver of Memory is to hold these important memories that can be used for advising the Elders. He will be the successor to the Giver and be called upon to advise the Elders in times of need by tapping into the past.
Explanation: