Assertion:
The supreme court "ordered a ban on registration of private non-commercial vehicles without Euro II emission norms in the national capital region (NCR) from April 1, 2000, to control the growing pollution".
RI. The rate of pollution now has become a threat to human life.
RII. So far, private non-commercial vehicles have been registered without Euro II emission norms in the NCR.
Answer: A
RII does not explain the reason. The situation given in RII does not necessitate the ban.
RI is a valid reason as it necessitate a ban on such vehicles as they threaten human life.