This checks awareness of a public health rule in India, the nationwide ban on smoking in public places.
15th August 2008: this date does not match the notified enforcement date of the ban.
2nd October 2008: correct. India's nationwide ban on smoking in public places, under the Cigarettes and Other Tobacco Products Act, came into force on 2nd October 2008, Gandhi Jayanti, chosen deliberately for its symbolic link to health and cleanliness.
15th August 2009: this is a year off from the actual enforcement date.
2nd October 2009: the month and day are correct but the year is wrong, the ban took effect in 2008, not 2009.
The correct option is B, 2nd October 2008, the date the nationwide public smoking ban took effect in India.