Each of the following four items consists of two statements, one labeled as Assertion (A) and the other labeled as Reason (R).Assertion (AS): The presidential system is successful only in the U.S.A.Reason (R): The United States of America is the only nation with minor contradictions that ensures the success of the presidential system.

• A. Both (AS) and (R) are true and (R) is the correct explanation of (AS).
• B. Both (AS) and (R) are true and (R) is not the correct explanation of (AS).
• C. (AS) is true, but (R) is false.
• D. (AS) is false, but (R) is true.