The answer is: The sea
Back then, the techology that exist to travel by sea was not as developed as it is today. If an empire decided to travel through the sea in order to do some conquests, that empire will risk several things, such as:
- Loss in directions
- The ships could be swallowed by harsh wheather in the middle of the sea
- It need a lot of resources to maintain the armies during the travel
The role of the emperor in the new government was largely
ceremonial and involved acting as a symbol of the state and the unity of the
people. Under Japan’s new constitution new constitution, drafted by U.S. occupation
authorities in 1946 and in effect from 1947, Japan became a constitutional
monarchy. Sovereignty resided in the people and the powers of
the Emperor were severely limited.
A merchant uses resources found in his own country to make goods to sell in other countries.
I am pretty sure the answer is B