The author bolds the view that the apple story is ______.

A．Do present-day children learn less than their forefathers in the good old days
B．Why do Japanese businessmen send their children to Japanese-staffed schools
C．Why can’t American children memorize enough geographic information
D．Is American education really worse than education in other countries

A．Newton was motivated to write the Principia after he saw the apple fell.
B．The Law of Universal Gravitation was originally included in the Principia.
C．Newton began to form the idea of the Principia when he was a college student.
D．The Law of Universal Gravitation was formulated long before the Principia.