Explanation:

- Option 1: Ladakh

- After the reorganization in 2019, Ladakh became a union territory.

- It is the largest union territory in India by area.

- Option 2: Chandigarh

- It is a small union territory, serving as the capital of both Punjab and Haryana.

- Its area is much smaller compared to Ladakh and others.

- Option 3: Jammu and Kashmir

- After 2019, it is now a union territory, but it is smaller in area than Ladakh.

- Option 4: Puducherry

- It is made up of several small enclaves on the southern coast.

- It has a small area.

The largest union territory in India in terms of area is Ladakh (Option 1) .