Read the passage carefully and answer the questions based on the passage:

The demographic advantage or 'dividend' to be derived from the age structure of the population is due to the fact that India is (and will remain for some time) one of the youngest countries in the world. A third of India's population was below 15 years of age in 2011. In 2020, the average Indian was only 29 years old, compared with an average age of 37 in China and the United States, 45 in Western Europe, and 48 in Japan. This implies a large and growing labor force, which can deliver unexpected benefits in terms of growth and prosperity.

What percentage of India's population was below 15 years of age in 2011?

33%

The correct answer is option 3: 33%

The passage clearly states: "A third of India's population was below 15 years of age in 2011."