Theodore Roosevelt worried about a war between Russia and japan because he wanted to maintain a balance of power throughout Asia.
Answer: Option A
Step-by-step explanation:
There was a war in Russia and Japan because both wanted to rule over the region of Asia and in this war Japan had an upper hand over Russia. But Theodore Roosevelt wanted to end the war between the two and wanted them to make peace because he was against violence and wars and he succeeded also in ending the war in a diplomatic way for which he also won a noble peace prize for peace.