The correct option is C Russia
The Treaty of Versailles was a conference on peace after the First World War, that took place in the city of Versailles located in France. The treaty observed delegations from 32 nations that were home to three fourth of the world’s population. The prominent players of this treaty were those countries that won the First World War, UK, US, Italy, Japan and France. But the defeated powers like Germany, Austria and Turkey were not invited to the conference. Russia, which stayed away from the war after the revolution, was not invited too.