Is the word leaf countable or uncountable noun?

Who said this in of pride & prejudice, and what type of irony does it show? “you mistake me, my dear. i have a high respect for your nerves. they are my old friends. i have heard you mention them with consideration these twenty years at least.” a. mrs. bennet: situational irony b. mr. bingley: dramatic irony c. elizabeth: proverbial irony d. mr. bennet: verbal irony