Answer :
Best answer is A) A ban on all travel.
The tempting answer is "building the Berlin Wall", but the Soviets actually instituted a travel ban in response to people leaving westward in 1956, 5 years before construction of the wall began in 1961,
The tempting answer is "building the Berlin Wall", but the Soviets actually instituted a travel ban in response to people leaving westward in 1956, 5 years before construction of the wall began in 1961,