question #1 : search this on yt Animated Map Shows How World War I Changed Europe's Borders
question #2 : I think this says something about the U.S. but also I think the U.S. had a role in the border changes because of the treaty that was signed after ww1
search this on wikipedia List of national border changes since World War I
The answer is D because astrophysical theory because that relates to astronomy. The other three are something the geologists can use to help them find out about the past. Hope this helped
