Option 1 matches Assam with the incorrect city `1 tan agar`. This is not a correct match as the capital of Assam is Dispur, not `1 tan agar`.
Option 2 matches Arunachal Pradesh with the incorrect city `Guwa-hati`. This is not a correct match as the capital of Arunachal Pradesh is Itanagar, not `Guwa-hati`.
Option 3 correctly matches Tripura with the capital city `Agartala`. This is the correct match as Agartala is indeed the capital of Tripura.
Option 4 matches Nagaland with the incorrect city `Shillong`. This is not a correct match as Shillong is the capital of Meghalaya, not Nagaland.
Therefore, the correct match is Option 3 - Tripura is correctly matched with the capital city Agartala.