C. By helping end the Russo- Japanese War, Theodore Roosevelt won the Nobel Peace Prize.
Explanation:
The Russo Japanese War was fought during 1904-1905 between Russia and Japan over rival imperial ambitions in Manchuria and Korea.
The war concluded with the Treaty of Portsmouth mediated by U.S. President Franklin Delano Roosevelt. The treaty was signed after negotiations held over a month. Roosevelt was instrumental for the signature of the treaty by both sides and, because of his efforts, he won the Nobel Peace Prize.
