Choose c for this question.

Reason: In the 1950s and 1960s, the United States occupied a vast international market, vigorously developed emerging industries and military and military industries, and experienced post-war economic prosperity. Affected by the economic crisis in the 1970s, the economic status declined. In the late 1970s and early 1980s, it was plagued by inflation. After the mid-1980s, the government adjusted its policies, and the situation gradually improved, but the debt burden increased. After 1990s, it entered the new economic era, and the economy developed steadily.

From this perspective, the American economy is not rapid, but very tortuous.

I hope it helps you.