Answer:
The correct answer is the last statement.
Explanation:
The monetary policy reaction curve shows the relationship between the inflation rate and interest rates. There exist a positive relationship between inflation and interest rates. That is an increase in one causes others to increase as well.
That is why the reaction curve is upward sloping. A steeper curve means that a small change in inflation leads to a greater increase in interest rates causing a greater change in output level.
A flatter curve, on the contrary, means that a greater change in inflation would cause a smaller change in interest rate. This would cause smaller change in output as well.