Final answer:
The correct answer based on World Bank estimates is that nearly 689 million people live on less than $1.90 a day, and about 50% of the world's population lives on less than $2.50 a day, not directly related to the Gini Index.
Step-by-step explanation:
The Gini Index is a statistical measure that is used to gauge economic inequality, including income distribution among a country's residents. However, the options provided in the question do not directly relate to the Gini Index itself. Rather, they pertain to various socioeconomic issues. According to the data, none of the options given accurately reflect the information associated with the Gini Index.
Instead, the correct data based on recent World Bank estimates (prior to 2020) indicate that about 689 million people live on less than $1.90 a day, and nearly 50% of the world's population lives on less than $2.50 a day. Additionally, it's noted that 80% of the world's population lives on less than $10 per day. This reflects the broader context of global poverty, rather than a direct reference to the Gini Index.