Which one of the following is the largest country area-wise?

Based on global geographical data, India is the largest country among the given options. India ranks as the seventh largest country in the world with a total area of approximately 3,287,263 sq km [1]. Following India in the list of options is Argentina, which ranks eighth globally with an area of about 2,780,400 sq km [1]. Kazakhstan is the ninth largest country, covering approximately 2,724,900 sq km [1]. Sudan was previously the largest country in Africa, but after the secession of South Sudan in 2011, its area significantly decreased to approximately 1.86 million sq km, making it smaller than the other three countries listed. Therefore, India stands as the largest country area-wise in this comparison, accounting for roughly 2.4% of the world's total land surface area [1].

Sources

1. [1] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 16: India–Political Aspects > Geographical Bases of India Federalism > p. 5