Which items on the list are primary sources a historian would use to understand why egyptian citizens participated in the political revolution that occurred in egypt in 2011

The right answer for the question that is being asked and shown above is that: "D.I and IV."

I. A letter written by a participant in the revolution
II. An article written by an American considering causes for the revolution
III. A historical text written about Middle Eastern revolutions over time
IV. A photograph of political protests during the revolution

A.I, III, and IV B.III only C.II and IV D.I and IV