Which of the Following Characterizes the Relationship Between Inflation and Unemployment

Multiple Choice

Which of the following characterizes the relationship between inflation and unemployment in the United States?
I. There have been periods in which a clear tradeoff between inflation and unemployment
Jseem to exist.
II. There have been periods in which inflation and unemployment rose together.
III. There have been periods in which inflation and unemployment fell together.

A) I, II, and III
B) I and II
C) I and III
D) I only