() is a principle of scientific method, based on the belief that the only things valid enough to confirm or refute a scientific theory are interpersonally observable phenomena, rather than people’s introspections or intuitions.

A. The description arouses readers’ certain expectations.
B. The description leads readers to the heroine, who is the little girl standing on the bank of the river.
C. With the description, the narrator reminisces about a February many years ago and begins to tell the story.
D. With the description, the narrator expresses his nostalgic look back decades ago.

A. will lead the way to lower mortality until 2020
B. will decline in death rates by 2010
C. will not suspend the quick mortality reductions until 2040
D. None of the above