I am 110% it is E because i have looked in all my books and that is the awnsrr
I believe the answer is: secondary prevention
Secondary prevention consist of efforts to prevent a certain diseases before it even fully developed in our body.
During this level of prevention, foreign substance or organism is already entering the victim body, but they still haven't reach the peak of their growth and start giving full effect to the body.
They would have used there natural resources such as logs and birch bark and animal hide