Why did eastern european countries prevent their citizens from traveling to the west?

a.
they wanted to protect them from western influence.

b.
the travel costs were too high.

c.
they knew that they would bring too many westerners home.

d.
they predicted that another world war would start.

how did the ussr convince other eastern european countries to be communist?

a.
through debate

b.
through reasoned argument

c.
by paying for all their costs

d.
by force