Which of the following is likely to encourage cultural divergence? A. improved communications
B. geographic isolation
C. access to technology
D. improved transportation

The sun's parallax would be 180 degrees, greater than which you can't get.  so a. would be your anwser 

Answergoogle earth; i believe this is the correct answer, plz check first;

It is useful for historians to write narratives so that history can be passed on from their point of view.  think about a story being told in third person, then think about it again being told in first person, by someone who actually experienced the event.

Intrusion is the best answer and the newest form.