Which of the following lists the monuments in chronological sequence?

Q. Which of the following lists the monuments in chronological sequence?
(a) Qutab Minar, Agra Fort, Fatehpur Sikri, Taj Mahal
(b) Qutab Minar, Taj Mahal, Fatehpur Sikri, Agra Fort
(c) Agra Fort, Fatehpur Sikri, Qutab Minar, Taj Mahal
(d) Agra Fort, Qutab Minar, Fatehpur Sikri, Taj Mahal
Ans: (a) Qutab Minar, Agra Fort, Fatehpur Sikri, Taj Mahal