One Day, After Their Psychology Class, Olivia and Hannah Are

One day, after their psychology class, Olivia and Hannah are talking about dreaming. Most mornings Olivia doesn't remember any of her dreams, but occasionally she has vivid recollections when she wakes. Hannah says she has the same experience and wonders why. When they talk to friends about the phenomenon, they notice a pattern related to the stress of the previous day. They verbalize this pattern as, "If someone feels stressed out over something one day, she is more likely to remember her dreams the following day." Olivia and Hannah have just formed a

A) scientific attitude.
B) valid statement.
C) hypothesis.
D) hindsight.