Why was the Berlin Wall built?

The Allies wanted to keep communists out of West Berlin.

City dwellers wanted to keep people from the country out.

Communists wanted to keep people in East Berlin.

Berliners wanted to erect a monument to the German people.

Suppose you are a freshmen in college and you have not declared a major. one reason you enrolled at your respective college was the school's vibrant social life. at the same time, you want to balance your academic life because you know that your grades will matter for graduate school or job applications.you decide to forgo partying for two hours to study for an upcoming economics exam. in your first semester's principles of economics class, you learn that the enjoyment you would have received from partying is an example of a(n)