The Plains Indians originated from the Great Plains and the Canadian Prairies. However, it is important to note that all of this prairie land stretches from Canada, to the United States and down to Mexico. It touches the following provinces of Canada: Alberta, Manitoba and Saskatchewan. The states it has land in are Colorado, Kansas, Montana, Nebraska, New Mexico, North Dakota, Oklahoma, South Dakota, Texas and Wyoming. In Mexico, it touches some territory in northern Mexico, but stops at the Rio Grande.
They are used to transfer water efficiently through the towns and cities of Rome.
A cultural system creates a unique world that is experienced as "reality" by its members. The people of a certain culture come to accept the "realities" which form its culture.
However, when groups of different cultures come together, their "realities" become confronted. Creating a clash of cultures. The outcome of this clash is decided by the material power of each of this groups. The group with the most material will emerge victoriously and end up influencing the other group with its cultural system. Therefore, individuals from the influenced culture will end up learning a new "reality" by force. On the other hand, individuals of the influencing culture tend to see the others as "objects of study".
Clashes of cultures have been occurring throughout time, affecting the cultural authenticity of groups. Due to the constant blend of cultures, it is nowadays, very difficult to consider that a certain cultural group is "truly authentic".
I think the answer is A
hope it helps :-)