Final answer:
Lady Catherine de Bourgh visits Longbourn to confront Elizabeth Bennet about her possible engagement to Mr. Darcy, which she vehemently opposes.
Step-by-step explanation:
Lady Catherine de Bourgh arrives early one morning at Longbourn in Jane Austen's 'Pride and Prejudice' for the specific purpose of confronting Elizabeth Bennet about the rumored engagement between Elizabeth and Lady Catherine's nephew, Mr. Darcy. Lady Catherine is a haughty noblewoman who strongly opposes this match due to Elizabeth's inferior social standing and the potential disadvantage it could pose to her own daughter's prospects. She seeks to put an end to it by demanding Elizabeth's promise not to accept Mr. Darcy's proposal.