In "How Archaeologists Found the Lost City of Troy," what is the author's purpose in mentioning locations, such as Ethiopia and the Nile River?

Ο to give a reference point to readers as to the possible location of Troy and the story of the Trojan War
Ο to lay out a timeline for discoveries of important artifacts from this time period
Ο to show that the story of the Trojan War has biblical ties
Ο to praise Schliemann for his excellent archaeological work