Assertion (A) : A phenomenon by which the majority group places the blame on a minority outgroup for its own social, economic or political problems is called scapegoating.
Reason (R): Scapegoating is a group based way of expressing frustration, and it often results in negative attitudes or prejudice against the weaker group.

Both A and R are true, and R is the correct explanation of A

The correct option would be: Option 1: Both A and R are true, and R is the correct explanation of A

Assertion (A): A phenomenon by which the majority group places the blame on a minority outgroup for its own social, economic, or political problems is called scapegoating. This is correct. 

Reason (R): Scapegoating is a group-based way of expressing frustration, and it often results in negative attitudes or prejudice against the weaker group. This is also correct. 

The reason (R) explains why scapegoating occurs (as a way of expressing frustration) and what its consequences are (negative attitudes/prejudice against weaker groups). This explanation directly supports and elaborates on the definition given in Assertion (A). The act of blaming a minority group (A) is because it's a way to express frustration (R), and it results in negative attitudes (R).