Suppose the U.S. lets two million immigrants from Syria move here and become American citizens in the next two years. How would this probably affect the U.S. unemployment rate? O The unemployment rate would fall at first, but later it would rise significantly. O The unemployment rate would not be affected by this wave of immigration. O The unemployment rate would rise sharply at first, but then it would return to a normal level in the long run. The unemployment rate would rise sharply at first, and it would probably stay much higher in the long run.