Final answer:
The three most populous countries, based on the information provided, likely are China, India, and the United States.
Step-by-step explanation:
To determine the three most populous countries according to the information provided, we would need to see which countries have the tallest bars on Figure A7, which represents leading countries by population in 2015. However, from the text, it is mentioned that China and India are the most populous countries. We do not have explicit information for the third country but based on population trends, it is most likely the United States. So we can place those countries in order as follows: China, India, and the United States.
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