He used riddling to talk to Smaug I think because he wanted to stall and waste time as he figured out a plan. He also used riddles to talk to Golem who he clearly was trying to stall to save himself as Golem wanted to kill and eat Bilbo. So it is a reoccurring theme of Bilbo and it makes sense.
Heyy,
I found a link to help u https://www.enotes.com/homework-help/what-an-example-verbal-dramatic-situational-irony-285361#answer....
Hope this helpss
Please don't delete or report its to help this person or anyone who needs the help.
~Girlygir101~
B is the answer. let me know if i’m wrong