The correct option is C Tomb of Humayun
The Diwan-e-Aam, Diwan-e-Khas, Rang Mahal, Mumtaz Mahal, Lahori gate, Meena Bazar and Mughal Garden are part of the Red Fort. Tomb of Humayun is present in Delhi but it is not part of Red Fort. The tomb was built by Humayun's wife, Hammeda Begum, after his death.