3. Suppose some firms have sticky prices, while others have flexible pricing. People have adaptive expectations. If the Federal Reserve expands the monetary supply in a way that increases inflation by 4% relative to last period, how much would the unemployment rate change if nothing else changes? O A. fall by 2% O B. fall by p, the parameter from the Phillips Curve O C. increase by /, the parameter from the Phillips Curve O D. fall by 4/6, the parameter from the Phillips Curve O E. increase by 4/0, the parameter from the Phillips Curve O F. it depends on people's expectations