The use of shoguns and samurai in japanese history shows that in feudal japan a) people could move between classes. b) military power was most important. c) china was the country' main rival. d) society was based on powerful businesses.

The correct answer is option B) "military power was most important". Shoguns and Samurai were figures of power during feudal Japan. Shoguns was the equivalent of general in the military nowadays, while Samurai were members of warrior caste that followed the code of honour "Bushido" and had military skills and recognizition. Both Shoguns and Samurais are examples of the importance of military power during feudal Japanese era.