Introductory Paragraph. See, first, Writing Introductory Paragraphs for different ways of getting your reader involved in your essay. The introductory paragraph should also include the thesis statement, a kind of mini-outline for the paper: it tells the reader what the essay is about.
He was the 27th president, and he is the only president that held both offices.
Bad weather caused a one-day delay of the invasion.
If the store owner is a Japanese American the best answer is A. He is making a statement that he is American just like everyone else and that even though he is of Japanese herriatage he did not commit crimes towards Americans at Pearl Harbor.
Even if the storeowner is not Japanese American it could be used to show solidarity with the Japanese Americans.