With what is 'the Demographic Dividend’ associated ?(a) the rise in the proportion of productive group of population(b) the reduction in the proportion of child-population(c) the reduction in the sex-ratio(d) the increase in the proportion of urban population.Which of the statement/s given above is/are correct ?

• A. (a) and (b)
• B. (c) and (d)
• C. (b) and (d)
• D. (d) only