Well a digression is a temporary departure from the main subject in speech or writing. So because the person writing the paragraph getting ill last year has nothing to do with this years cookie sale, I think you are correct, sentence 3 is an example of a digression. So D is the answer.
Word Choice. Hope this helps!
probably really basic ones but i like boku no hero academia, jujutsu kaisen and hmmm erased is alright too
