Option 1 -> 2000 was the year when states like Chhattisgarh, Jharkhand, and Uttarakhand were formed, not related to Ladakh's UT status.
Option 2 -> 2002 saw no significant administrative changes regarding Ladakh's territorial status.
Option 3 -> 2014 had no connection to Ladakh becoming a separate Union Territory.
Option 4 -> 2019 is when Ladakh was officially designated as a Union Territory on October 31st.
Hence, Option 4 (2019) -> Ladakh became a Union Territory on October 31, 2019, following the reorganization of the erstwhile state of Jammu and Kashmir into two separate Union Territories: Jammu & Kashmir, and Ladakh -> correct