Consider the following graphs. The curves in the graphs indicate different age groups in the populations of two countries A and B over a period of few decades:

With reference to the above graphs, which of the following are the most logical and rational inferences that can be made?

Over the last two and a half decades, the dependency ratio for country B has decreased.

By the end of next two and a half decades, the dependency ratio of country A will be much less than that of country B.

In the next two decades, the work-force relative to its total population will increase in country B as compared to country A.

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