Explanation:

- Birth: A person can become a citizen of India by being born in India, given certain conditions are met.

- Acquiring Property: ???? Owning property in India does not qualify someone for Indian citizenship. There is no direct condition in the citizenship laws relating to acquiring property as a means to gain citizenship.

- Descent: An individual can acquire Indian citizenship through descent, particularly if they are born outside India to Indian parents.

- Naturalisation: This is a process where a foreign citizen can become an Indian citizen after fulfilling residency requirements and other conditions.

Correct Answer: Option 2 - Acquiring Property