Explanation:

- India has one of the largest diasporas in the world. People from India have migrated to various parts of the world in significant numbers over the years.

- India is Correct: With millions living abroad, India tops the list of countries with the largest diaspora as per the World Migration Report 2018.

- Mexico has a considerable number of its citizens living in other countries, especially in the United States, but it does not surpass India.

- China's diaspora is also significant, with many Chinese communities established globally, yet it's not the largest.

- Bangladesh has a notable diaspora, especially in the Middle East and Europe, but smaller compared to the others mentioned.