How many adolescents are there in the world? a) 1-2 billion b) 2-3 billion c) less than 1 billion d) more than 3 billion

Adolescents comprise children who are in their early adulthood. These include all teenagers. More specifically, children in age groups 10 to 19 are considered as adolescents.

According to WHO reports, every 1 in 6 persons is an adolescent on the Earth.

There are around 1.2 billion adolescents on the Earth.

So, the correct answer is ‘a’ (1-2 billion).