Given below are two statements, one labelled as Assertion (AS) and the other labelled as Reason (R):Assertion (AS): 'Social indicator movement' was quickly developed in 1960s in the United States of America (U.S.A.).Reason (R): It grew in response to rise of a wide range of social problems in U.S. Society.In the context of the above statements, which one of the following is correct?

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