What Is Suggested by the Findings of Economists Alan Blinder

What is suggested by the findings of economists Alan Blinder and Mark Watson with respect to the domestic economy?

A) When factors related to presidential luck are controlled, Republican economic policies lead to more growth.
B) The partisan gap in management clearly shows that Republican presidents are more likely to be in office during periods of high consumer confidence.
C) There is no pattern outside of sheer luck that accounts for the partisan difference in economic management.
D) There is a clear partisan gap in economic performance that favors Democratic presidents.