Final answer:
After sustained pressure from Russia, Japan pulled out its troops in 1867. Hence the correct option is A.
Step-by-step explanation:
In 1867, Russia, under sustained pressure from Japan, decided to pull out its troops from territories it held in the Far East. The specific event referred to here is the culmination of the Russo-Japanese War (1904-1905), not 1867 as mentioned in the question.
The Treaty of Portsmouth, mediated by U.S. President Theodore Roosevelt in 1905, played a crucial role in bringing an end to the conflict.
The Russo-Japanese War was primarily fought over territorial disputes in East Asia, particularly in Korea and Manchuria. Japan sought to expand its influence in the region, and tensions between the two nations escalated into armed conflict.
The war ended with the signing of the Treaty of Portsmouth, where Russia agreed to withdraw its troops from the Liaodong Peninsula and recognize Japan's influence in Korea. This marked a significant geopolitical shift in the balance of power in East Asia and demonstrated Japan's emergence as a major regional player in the early 20th century.
The correct answer is a) Russia, Japan.