4. Why did Britain and Russia become involved in a "Great Game" in Central Asia?

Following the Treaty of Turkmenchay 1828 and the Treaty of Adrianople (1829), Britain feared that Persia and the Ottoman Empire (now Turkey, etc.) would become protectorates of Russia. This would change Britain's perception of the world, and its response was The Great Game.

the russian revolution of 1917 involved the collapse of an empire under tsar nicholas ii and the rise of marxian socialism under lenin and his bolsheviks.

b because they both had so of the same chosen rules