Correct Option: B

Haji Begum built the tomb of her husband. Her important architectural legacy, is the mausoleum o her husband, Humayun's tomb at Delhi, which she commissioned in the late 16th century. The mausoleum was the first one to have been built for a Mughal emperor and was the first garden-tomb on the Indian subcontinent. Begum was also known as Haji Begum after she undertook the pilgrimage to Haji.