Answer:
Answer B Industrialization of an area
Explanation:
Answer A doesn't have enough of an impact on the forest
Answer C While has an effect on the environment doesn't directly relate to deforestation
Answer D Again does have an effect on our environment but isn't the leading cause in deforestation
I would say C. Barbed Wire, so no one could get in or the animals could not get out.
Hope this help you!
The answer is A. They were serving for pay and were willing to switch sides.