Option 1 states that the percentage of India`s population to the world population is 8%. This is not the correct answer.
Option 2 states that the percentage of India`s population to the world population is 16%. This is the correct answer based on the information provided in the question.
Option 3 states that the percentage of India`s population to the world population is 26%. This is not the correct answer.
Option 4 states that the percentage of India`s population to the world population is 28%. This is not the correct answer.
The correct answer is option 2, as per the 2001 Census, India`s population accounted for 16% of the world population.