The dependency ratio compares those typically not in the labour force (young and old) with those in working ages. A high ratio means each worker supports more dependents, increasing pressure on families and public finances. A lower ratio can create conditions favourable for a demographic dividend if accompanied by jobs and skills. Thus, the ratio of dependents to workers is the key idea.
Option A:
Option A is incorrect; the level of urbanisation is a separate measure and does not by itself show dependency patterns.
Option B:
Option B is correct because it clearly states that children and elderly together are compared with the working-age group to assess economic support burden.
Option C:
Option C is incorrect since the proportion of women relates to sex composition, not age-dependency.
Option D:
Option D is incorrect because migration rate does not indicate how many non-workers each worker must support.
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