The correct option is D Bijapur
Gol Gumbaz is situated in Bijapur. In Bijapur, it is called the whispering gallery because when one whispers, lingering echo of the whisper is heard in the opposite corner. It is the mausoleum of Adil Shah, the Sultan of Bijapur. Construction of the tomb was started in 1626 and was completed in 1656.