Concept:The dependent population is the portion not in the labour force; it includes the young and the elderly.Explanation:From the age distribution, the young dependents form 45% of the population.The aged dependents form 15% of the population.To find the total dependent population, add these two groups together.So the dependent population is 45%+15%=60%.This means that 60% of the country's population depends on the remaining working-age population for economic support.Answer:60%, i.e. Option B.