Which of these is an example of first-person point of view? A. You anxiously look to the snowy fields,
B. She gently looks out to the snowy fields,
C. I quietly look across the snowy fields,
D. We look at the soft snow in the fields,

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.

he will find out what went wrong or happened and how.