China and India share a distinction regarding their populations. What is it?

a. Approximately two-thirds of their populations live in urban areas
b. Both populations have grown to more that one billion people
c. About 20 percent of their population are immigrants
d. Each has reversed its growing trend

a. Approximately two-thirds of their populations live in urban areas

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The distinction that China and India share regarding their populations is that both populations have grown to more than one billion people. To find this answer, you can start by searching for the current population of China and India individually. According to the latest data, both countries have populations exceeding one billion. China has the highest population in the world, with over 1.4 billion people, while India is the second-most populous country, with over 1.3 billion people. Therefore, the correct answer is option b.