The passage mentions all of the following as causes of the decline of political organizations in the United States except ______.

A．American political parties in the twentieth century.
B．The role of ideology in American politics.
C．The future direction of United States politics.
D．Difference between Republicans and Democrats.

A．people are more interested in fast automobiles than in their health
B．Americans feel more closely tied to their cars than to their wives
C．kerosene-burning engines would pollute the environment more than gasoline-burning engines do
D．kerosene-burning cars would go faster than gasoline-powered cars