The correct answer is 'maangta' which means 'to demand or claim' in this romantic context. The line means 'You are someone else's love, yet someone else demands/claims you.' This creates a poetic tension - the speaker loves someone who belongs to another, while a third person also desires them. 'Jaanta' means to know, 'chahta' means to want, and 'pyar karta' means to love, but only 'maangta' captures the sense of wrongful claim.