The tsar was quick to agree to negotiate a peace treaty to end the russo-japanese war mainly because
a. russia feared that japan would totally crush its forces.
b. russia was running low on fighting resources.
c. russia was winning but was unsure that it could continue to win.
d. russia was fighting a strong military from afar

The correct answer is D. Russia was fighting a strong military from afar

Explanation:

The Russo-Japanese War was a military conflict between the Japanese and the Rusian Empire from 1904 to 1905 for the dominance of Korea (East Asia) and Manchuria (Northeast Asia). This war ended with the Treaty of Portsmouth  in 1905, as the Russian Army and Navy were defeated during multiple battles, and even though Rusia still have resources and troops to fight against Japanese this would not have changed the result as Japanese military force surpassed the Rusia military force and Russia economy was in crisis, due to this, the war was not supported by Russians. Due to this, the Tsar who was the leader of the empire decided to begin the negotiations and signed a peace treaty as Japanese military force was stronger from afar.