Answer:
The correct answer is option 2, Bulgaria.
Explanation:
As the complete question is not given, the complete question with the answer choices is attached herewith.
The options are
The Soviet Union and seven of its European satellites sign a treaty establishing the Warsaw Pact, a mutual defense organization that put the Soviets in command of the armed forces of the member states.
The Warsaw Pact, so named because the treaty was signed in Warsaw, included the Soviet Union, Albania, Poland, Romania, Hungary, East Germany, Czechoslovakia, and Bulgaria as members.