By saying "Indeed, many of the things we think of as ’100 percent American’ came from other cultures" (Line 3, Para.1), the author suggests that the American culture is ______.

A．They narrowly escaped crashing into each other.
B．One plane climbed above the other at the critical moment.
C．They bumped into each other over a swimming pool.
D．They avoided each other by turning in different directions.

A．When they’re unable to control the person’s behavior.
B．When the causes of the behavior are obvious.
C．When the consequences of the behavior are unpleasant.
D．When the behavior is expected.