Correct answer: D. Fatehpur Sikri
Explanation: The direct answer is D: Fatehpur Sikri. The tomb, or dargah, of Sheikh Salim Chishti is located in the sacred complex of Fatehpur Sikri in present-day Uttar Pradesh. The reasoning is based on the connection between Mughal emperor Akbar and the Sufi saint Sheikh Salim Chishti. Akbar visited the saint, and after the birth of his son, the future emperor Jahangir, he developed Fatehpur Sikri as an important Mughal royal site. Option D is correct because the white marble dargah of Sheikh Salim Chishti stands inside the Fatehpur Sikri complex, near the Buland Darwaza and Jama Masjid. Option A, Red Fort, was built mainly by Shah Jahan in Delhi and is not the location of this dargah. Option B, Agra Fort, was a Mughal royal fort but does not contain Sheikh Salim Chishti’s tomb. Option C, Sikandra, is famous mainly for Akbar’s tomb, not for this saint’s dargah. The memory cue is: Akbar, Sufi saint, and Fatehpur Sikri form one connected group.