Manuel has chosen to write a reflective essay about his trip to Mexico to visit some relatives he had never met before. Which writing goal would be most appropriate?
to describe ways that Mexico is different from the United States
to explain how the visit affected his thoughts about himself and his family
to describe what he saw and did during his visit with his relatives in Mexico
to explain who his relatives are and why they invited him to visit them in Mexico

quite an interesting way to teach topic sentences, because the answer to this question is the best definition of a topic sentence that one can present, it is as if answering the questions taught you how to do it, this is some real teaching, it is terribly well-done.

the topic sentence in this paragraph is:

topic sentences writers stay on track and keep a paragraph from becoming an aimless collection of sentences about an idea.

which incidentally tells you what a topic sentence should be.

who is marty in this situation?