The answer is All of the above! Hope this helps!
The relationships between Native Americans and Americans started in a positive way when the two groups began trading resources in the early 1600's. The Native Americans traded for household goods, tools, and traps, while the colonists traded for corn, fur, and other resources. However, the colonists started exploring and expanding the empire into Central and Western North America, and they felt the Native Americans were an interference and issue to their life of exploration and success. This is where the negative side of their relationship begins. The Americans started killing any tribes that got in their way, which led to the destruction of some of the tribes.
Answer:
I'd say B. Human activity
Explanation:
I'm not sure though but I say B because now we have phones and can text (so that removes C) cultural exchange (Also through phones removing D) and financial stability isnt influenced by land (hopefully thats common sense or I'm just not smart)
C. Both the GNP and the percentage of high school graduates rose.
History is in high school, usually around 10 and 11th grade
Hope this works:)