What was the name of the treaty that ended World War I and imposed heavy reparations on Germany?

The Treaty of Versailles is the correct answer because it was the formal agreement that concluded World War I in 1919. This treaty placed significant responsibility for the war on Germany and imposed heavy reparations, which were financial payments intended to compensate the Allied nations for the damages inflicted during the conflict. The treaty included various clauses that limited Germany's military capabilities, stripped it of territories, and led to substantial economic and political repercussions for the country.

The other treaties listed address different contexts and nations: The Treaty of Paris is mainly associated with ending the American Revolutionary War and other later conflicts, the Treaty of Trianon dealt with the post-World War I settlement for Hungary, and the Treaty of Saint-Germain focused on Austria. Therefore, they do not relate to the conclusion of World War I in the same manner as the Treaty of Versailles.