Final answer:
In 2012, the country with the most people living in extreme poverty was likely India, as it is part of South Asia where poverty is heavily concentrated and it is one of the most populous countries in that region.
Step-by-step explanation:
In 2012, the country with the most people living in extreme poverty, defined as living on less than 1.90 international-$ per day, appears to be in Asia. While the student's question refers to a specific graph with a country highlighted in blue which isn't provided, we can infer from the given data that Asia, and more specifically South Asia, has a high concentration of people living in extreme poverty. Countries like India would be prime candidates for having the largest number of people living under these conditions. This is supported by the information that approximately half of the world's extreme poor lived in just five countries: India, Bangladesh, Nigeria, the Democratic Republic of the Congo, and Ethiopia. Additionally, given that Asia holds 60 percent of the world's people who live in slums and most poverty in Asia is concentrated in South Asia, it is likely that India, being the most populous country in this region, had the most people living in extreme poverty in 2012.