The correct answer is: B. into
Sultan Mahmood of Ghazni was a 11th-century Turkic ruler who led a series of invasions into India. The word “into” is the most appropriate preposition to use in this context because it indicates that Mahmood’s invasions were directed at India itself. The other options are not as accurate because they do not convey the same sense of direction. For example, the word “against” could be used to describe an attack on a specific target, but it does not necessarily mean that the target is located within a particular country. Similarly, the words “upon” and “on” can be used to describe an action that takes place in a particular place, but they do not necessarily mean that the place is a country.
In conclusion, the correct answer is “into” because it is the most accurate preposition to use in the context of Sultan Mahmood’s invasions of India.