That's true. When doing research you look up information helping for writing and developing a piece for readers.
The answer is expository, <span>A memoir is a special kind of </span>autobiography<span>, usually involving a public portion of the author's life as it relates to a person, historic event, or thing. The text is about the personal knowledge and/or experiences of the author.</span><span />
I would say C probably. the text sort of explains how each decade is different from the previous one, but it doesn't seem to really show a strong "cause and effect."
sorry I wasn't very helpful.
