Option 1 -> Deven does not make any comparison between Hindi and Urdu or argue for their equal importance in his response.
Option 2 -> Deven actually confirms he is a Hindi lecturer at Lala Ram Lal College, rather than denying it.
Option 3 -> The passage shows Deven continuing the conversation and providing explanations, not leaving.
Option 4 -> Deven provides a detailed account of his childhood in Lucknow, his father's influence, his father's death, his move to Delhi, attending a Hindi-medium school, and his need to earn a living for his family.
Hence, Option 4 -> Deven stumbles through a personal explanation, detailing how circumstances beyond his control—his father's death, relocation to Delhi, economic necessity as a married man—led him to teach Hindi despite his love for Urdu and his father's teachings -> correct