Answer;
-Colonel Fitzwilliam told Elizabeth that Mr. Darcy had saved Charles Bingley from an imprudent marriage.
Step-by-step explanation;
-Elizabeth encounters Darcy and his cousin frequently in her walks through the countryside. During one conversation, Colonel Fitzwilliam mentions that Darcy claims to have recently saved a friend from an imprudent marriage.
-Elizabeth conjectures that the “friend” was Bingley and the “imprudent marriage” a marriage to Jane. She views Darcy as the agent of her sister’s unhappiness.