The Ibadatkhana at Fatehpur Sikri was built by Akbar, the Mughal emperor. The Ibadatkhana, also known as the "House of Worship," was a significant structure within the city of Fatehpur Sikri. It served as a multi-faith meeting place where various religious discussions and debates took place.

Option 1: Akbar - This is the correct answer. Akbar, known for his religious tolerance and curiosity towards different religions, commissioned the construction of the Ibadatkhana.

Option 2: Jahangir - Jahangir was the son of Akbar and became the Mughal emperor after his father`s death. However, he did not build the Ibadatkhana.

Option 3: Shahjahan - Shahjahan, the builder of the Taj Mahal, was another Mughal emperor, but he was not responsible for constructing the Ibadatkhana.

Option 4: Aurangzeb - Aurangzeb, another Mughal emperor, is known for his conservative religious policies. However, he did not build the Ibadatkhana at Fatehpur Sikri.

In conclusion, the correct answer is option