1st picture: C, D
2nd picture:C, D
3rd picture: A, D
The Suez Canal between the Sinai Peninsula (Asia) and the rest of Egypt (Africa).
The ridgeline of the Darien Mountains, where water flows different directions on either side (the watershed boundary), and Colombia and Panama meet, is a common dividing line for the Americas.
A Historian would look for a primary source (option d. ) - the definition of a primary source is that it was written at the time of the event, and not later (this is the secondary choice).
