The character who exhibits irony in the Canterbury Tales is the Miller, who steals the grain he grinds.
He is a disgusting man, who grinds the grain, then sells it to his customers for a very high price, and then steals it from them to sell it again.
Exposition is the real answer
Euphemism. As "he is all thumbs" is a polite way to say he is clumsy (not being offensive) hence it comes under euphemism.
No, "the" is not a preposition as it does not describe a place in which something is. "The" would be called an article, like "a" or "an".
The answer to your second question, therefore, is D. Joanna hid the gift behind the couch, as "behind" would be the preposition because it describes where the gift is.
I hope this helps!
