How does Twain's use of charged language such as "exceedingly self-satisfied monarch" best advance his viewpoint?

It illustrates Twain's feelings about traveling by rail through the French countryside.
It provides the readers with an idea of Twain's admiration for the French railroad conductor.
It reveals Twain's belief that American railroad workers are inferior to those of France.
It shows the reader that American railway workers are smug and feel superior to the passengers.