India is regarded as a country With "Demographic Dividend" This is due to

The correct answer is B. A demographic dividend arises when the share of working-age people, conventionally taken as 15 to 64 years, rises relative to the dependent population. Fewer dependants per worker free up resources for savings, investment and productivity, provided the workers are employed and skilled.

• A is wrong: A large under-15 population means a high dependency ratio. That is a burden, not a dividend, until these children enter the workforce.
• C is wrong: The above-65 group is dependent. A large elderly share signals ageing, which is the reverse of a dividend.
• D is wrong: Sheer total population is not the criterion. A large population with a high dependency ratio gives no dividend, and a country can gain a dividend with a stable total.

The core concept is the age-structure transition: falling fertility and mortality first widen the working-age share, and the window closes as the population ages. For Mains, this links to GS-III on employment generation and skill development, and to GS-II on whether education and health outcomes are good enough to turn numbers into productivity.

Trap: Candidates pick A because a young population sounds like an advantage. The dividend comes only when those young people reach working age and find jobs.