Final answer:
The actual rate of unemployment would be lower than 4 percent.
Step-by-step explanation:
The actual rate of unemployment can be determined by considering the difference between actual output and potential output. In this case, if the actual output is 2 percent above potential output, it means the economy is operating above its potential level. With a natural rate of unemployment of 4 percent, the actual rate of unemployment will be below this level. Therefore, the actual rate of unemployment would be lower than 4 percent. From the given options, the closest answer would be B. 0 percent.