In the long run, the Phillips Curve is:
a) horizontal at a fixed price level vertical at the natural rate of unemployment
b) downward sloping, illustrating the tradeoff between inflation and unemployment
c) upward sloping, illustrating a positive relationship between inflation and unemployment

a) horizontal at a fixed price level, but vertical at the natural rate of unemployment

Explanation:

Phillip Curve was proposed in 1958 by economist A.W. Phillips. The Phillips curve depicts the inverse relationship between inflation and unemployment: as unemployment decreases, inflation increases.

While stable and predictable, in the long run;

Phillips Curve vertical line shows relationship between inflation and unemployment when the economy is at full employment, such that, inflation and unemployment are unrelated in the long run.

both the house and senate must approve the conference report.   after it is approved by both on an identical from, it will be sent to the president.   if the president approves it, it will become law.