The correct answer is option 3, Rajatarangini. Rajatarangini is a historical work that deals with the history of Kashmir.
Option 1, Gaudavaha, is not the correct answer. Gaudavaha does not specifically focus on the history of Kashmir, but rather refers to the historical account of the Gauda region in Bengal.
Option 2, Harshacharita, is also not the correct answer. Harshacharita is a biography of Emperor Harsha of the Gupta Empire, and it does not specifically cover the history of Kashmir.
Option 4, Vikramankadev acharita, is not the correct answer. There is no known historical work with this name that deals with the history of Kashmir.
Therefore, the correct answer is option 3, Rajatarangini. It is a historical work written by Kalhana, which provides a detailed account of the history of Kashmir, including the rulers, dynasties, and events that took place in the region.