A political cartoon shows several men marching in line. Each man except the first has a fist raised, as if ready to hit someone. The first man is labeled Serbia, and he says, "If you touch me, I'll." The second man is labeled Austria, and he says, "If you make a move, I'll." The third man is labeled Russia, and he says, "If you hit that little feller I'll." The fourth man is labeled Germany, and he says, "If you strike my friend I'll." The fifth man is labeled France, and he says, "If you hit him I'll." The sixth man is John Bull, representing Britain, and he says, "Hi there if you don't." What is the best summary of this cartoon?

World War I could have been avoided if Russia had been less intimidating.
World War I was entirely the fault of Serbia and its ambitions.
World War I resulted from a chain reaction involving many nations.
World War I was caused by Austria’s declaration of war on Serbia.