Answer: Option (b) is correct.
Step-by-step explanation:
According to the economists, there will be no trade-off between the inflation and the unemployment in the long run.
We all know that Philips curve represents the inverse relationship between the inflation and unemployment in the short run.
The vertical line at the natural rate of unemployment in the Philips diagram represents the long run Philips curve. This curve shows that there is no relationship between inflation and unemployment.