Why is district 12 surrounded by fences in the hunger games?

Answer 1

District 12 is fenced in 1, because it is to keep out dangerous predators, such as wolves and bears. 2 because supposedly it's supposed to be electrified to keep the people in district 12 from leaving. But it's not, so it just keeps predators out.

Answer 2

Because they don't want them to get food from the forest, and they are not allowed to hunt.

Answer 3

So that the people of District 12 won't get out

Answer 4

So the people cant escape their district.