Final answer:
Based on the data from the UN Population Division for 2010 and additional statistics from 2015, China has the largest population among the listed countries with 1,300 million people, making A. China the correct answer to the question.
Step-by-step explanation:
According to the data provided, which relies on information from the UN Population Division in 2010 and additional population statistics from 2015, it is clear that of the listed countries, China has the largest population. The graph mentioned in the question, although not provided here, typically would show the population of various countries with the heights of bars corresponding to the size of each country's population. In the scenario described, China's population is shown to be 1,300 million (or 1.3 billion), which surpasses India's population of 1,200 million (or 1.2 billion), followed by the United States with just over 300 million, Indonesia with under 300 million, Brazil with 200 million, and Pakistan with just under 200 million. This data is consistent with the known fact that China and India are the most populous countries in the world.
Furthermore, projections from the U.S. Census Bureau indicate that while India is expected to surpass China's population around 2025, China was still the most populous country in 2010 and 2015. Additionally, future projections mention that the U.S. will remain the third most populous country with a population increase to 423 million by 2050. These facts reinforce that as of the data points referenced (2010 and 2015), China is the correct answer to the question of which country has the largest population.
Please note that these data represent past figures and projections, and the actual current populations could be different. However, based on the provided data and historical context, the correct option is A. China.