Read the passage. From “The Notorious Jumping Frog of Calaveras County” And [Smiley] had a small little bull-pup, that to look at him you’d think he warn’t worth a cent but to set around and look ornery and lay for a chance to steal something. But as soon as money was up on him he was a different dog; his under-jaw’d begin to stick out like the [forward part of the upper deck] of a steamboat, and his teeth would uncover and shine like the furnaces.
What is the bolded verbiage an example of?

an incongruity

a hyperbole

social commentary

a human foible