He is 'of course' a lair. Here 'of course' is which parts of speech?

newbie construction workers preparing to work at a job cite but are first going over safety concerns?

definition was not one of the four methods

n arraignment is not a hearing to determine guilt or innocence. it is usually a criminal defendant's first appearance in court 

i would believe it would be b., the author wants to draw the reader deeper into the experience