The Russo-Japanese War was a war between the Japanese Empire and the Russian Empire. It started in 1904 and ended in 1905. The Japanese won the war, and the Russians lost. The war happened because the Russian Empire and Japanese Empire disagreed over who should get parts of Manchuria and Korea.
Because it offers the historian an objective snapshot of the public sentiment of the time, which the cartoonist (should be) distilling for their readers, according to their feelings, for mass appeal. I say objective as it is usually very easy to decipher their subjective viewpoint according to the publication. The value of this is that it is tapping into how the masses 'feel' rather than how subjective facts can be built to form historical opinion. It becomes especially valuable prior to this century, when public sentiment is harder to garner as we were less technologically advanced.
Because it is the state within the state. Vatican is a state which is governed by the Pope.
The answer is A. precedent