According to the provisional figures of Census 2011 the percentage of India’s population to the world population is

16
16.5
17.5
18

The correct answer is (b). According to the provisional figures of Census 2011, India’s population is 1210.2 million, which is 16.5% of the world population of 7123.3 million.

Option (a) is incorrect because it is less than the actual percentage. Option (c) is incorrect because it is more than the actual percentage. Option (d) is incorrect because it is not a possible percentage.