The original tomb of Sheikh Salim Chishti in Fatehpur Sikri, built in red sandstone, was later converted entirely into white marble by Emperor Jahangir. Jahangir revered the Sufi saint, who had blessed his father, Akbar, with the birth of an heir (Jahangir himself). The marble tomb is today a prominent spiritual site and architectural marvel. The correct answer is (D) Jahangir.