Given below are two statements, one labelled as Assertion (AS) and the other labelled as Reason (R):Assertion (AS): As compared to other methods of psychological research, experimental method is usually considered to be best suited for studying cause and effect relationship.Reason (R): Secondary variance is more efficiently controlled in experimental method.In the context of the above two statements, which one of the following conclusion is correct?

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