(A) ** Negotiating peace in the Russo-Japanese War.
(B) Negotiating peace in the Spanish-American War.
(C) For his Big Stick Policy.
(D) For the Roosevelt Corollary.
EXPLANATIONS BELOW
Concept note-1: -Theodore Roosevelt, President of the USA, received the Peace Prize for having negotiated peace in the Russo-Japanese war in 1904-5. He also resolved a dispute with Mexico by resorting to arbitration as recommended by the peace movement.
Concept note-2: -The treaty ending the Russo-Japanese War (1904-1905) was signed at Portsmouth Naval Base in New Hampshire on September 5, 1905. President Theodore Roosevelt had accepted the request to mediate the settlement of the war, a service for which he would later be awarded a Nobel Peace Prize.
Concept note-3: -The Treaty of Portsmouth, signed on September 5, 1905, officially concluded the Russo-Japanese War of 1904-1905. President Theodore Roosevelt won the Nobel Peace Prize for the role he played in the negotiations that ended the conflict.
Concept note-4: -At the Russo-Japanese War, Roosevelt assisted Japan in various forms including financial assistance to check the invasion of Manchuria by Russia, and contributed to the conclusion of the Russo-Japanese Peace Treaty (Portsmouth Treaty) hoping the peace under the balanced power between Japan and Russia.
Concept note-5: -The Treaty of Portsmouth is a treaty that formally ended the 1904–1905 Russo-Japanese War. It was signed on September 5, 1905, after negotiations from August 6 to August 30, at the Portsmouth Naval Shipyard in Kittery, Maine, United States.