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.
Marielle Tsukamoto
An interviewee is the person that is being interviewed. In "Inteview with Marielle Tsukamoto, Marielle Tsukamoto is the one who is being interviewed. The interviewer is the one who is asking the questions. 5th-grade students are the ones asking the questions so they are the interviewers.
The entire interview is about Marielle Tsukamoto's experience as a Japanese American during World War II. Most specifically about her time in an internment camp.
The correct answer is D, 'River' is the word which should be capitalized.