Land needed to be cleared for farming,and since deforestation is already a problem.
Because the US needed to honor its vow to defend Russia
Specific people who valued religion quite significantly played a role in this. I have studied this material so long ago that I cannot name those particular figures. Do some research and I'm sure you'll be able to find out for yourself.
It’s B
The Berlin Wall was built by the German Democratic Republic during the Cold War to prevent its population from escaping Soviet-controlled East Berlin to West Berlin, which was controlled by the major Western Allies.