The answer you are looking for is option B
Nomads will move from place to place typically looking for shelter and other things
When observational data are being collected, the observer’s
presence may cause a person to behave differently, a phenomenon known as reactivity.
<span>
To add, </span>reactivity<span> <span>is a
phenomenon that occurs when individuals alter their performance or behavior due
to the awareness that they are being observed. The change may be positive or
negative, and depends on the situation.</span></span>
Answer: The government thought Native Americans stood in the way of westward expansion.
