Answer:
There are usually three ways that people react to change: Be non-active. Be reactive. Be proactive and positive
As people begin to react to the change, they may start to feel concern, anger, resentment, or fear. They may resist the change actively or passively. They may feel the need to express their feelings and concerns, and vent their anger.
Answer: C
Explanation: If you look at the second sentence beggining only C makes sense. I also did the test of Edgeinuity. I hope it helps!
Serfs paid the owner of the land (in the form of labor) to be able to live on the land and have protection, if the serf were to leave. It was usually an unspoken agreement that they serf would stay on the land. If you still need further information you might find some on http://www.thefinertimes.com/Middle-Ages/serfs-in-the-middle-ages.html