The correct answer is option 2: Jammu and Kashmir.

G.C. Murmu was the Lieutenant Governor/Administrator of Jammu and Kashmir prior to his appointment as the Comptroller and Auditor General of India in August 2020.

To understand the options:

- Option 1: Ladakh is a Union Territory, but G.C. Murmu was not the Lieutenant Governor/Administrator of Ladakh.

- Option 3: Chandigarh is a Union Territory, but G.C. Murmu was not the Lieutenant Governor/Administrator of Chandigarh.

- Option 4: Puducherry is a Union Territory, but G.C. Murmu was not the Lieutenant Governor/Administrator of Puducherry.

Therefore, the correct option is 2: Jammu and Kashmir.