Step 1: Understanding the Question:
We evaluate Assertion (A) on the 'warrior gene' and Reason (R) on the Expiatory theory of punishment.
Step 2: Detailed Explanation:
• Assertion (A): The biological school of criminology links genetic factors such as the MAOA ('warrior') gene with a predisposition to aggressive or criminal behaviour. As per the NTA key, (A) is taken as correct.
• Reason (R): According to the Expiatory theory, if an offender repents and expiates, he or she should be forgiven rather than punished. This is a correct description of the theory.
• However, the Expiatory theory is a theory of punishment and has no bearing on the genetic basis of crime, so (R) does not explain (A).
Step 3: Final Answer:
Both (A) and (R) are correct but (R) is not the correct explanation of (A). The correct option is (B).