SOLAR SYSTEM

Detailed explanation-1: -The Treaty of Versailles was the most important of the peace treaties that brought World War I to an end. Hence, the correct answer is Option 2. The Treaty ended the state of war between Germany and the Allied Powers. It was signed on 28 June 1919 in Versailles.

Detailed explanation-2: -The tidal wave of change culminated with the fall of the Berlin Wall in November 1989, which symbolized the collapse of European Communist governments and graphically ended the Iron Curtain divide of Europe.

Detailed explanation-3: -The USSR made significant achievements with the help of socialist policies. The USSR was the first country to launch a satellite in the history of humankind. Yuri Gagarin became the first astronaut to travel to space. The USSR under the leadership of Joseph Stalin defeated Germany in the Second World War.

Detailed explanation-4: -The unsuccessful August 1991 coup against Gorbachev sealed the fate of the Soviet Union. Planned by hard-line Communists, the coup diminished Gorbachev’s power and propelled Yeltsin and the democratic forces to the forefront of Soviet and Russian politics.