Final answer:
The provided excerpts do not include Elizabeth's reaction to Darcy saving Bingley from an imprudent marriage; however, in 'Pride and Prejudice,' her initial reaction is one of anger and disbelief.
Step-by-step explanation:
When Elizabeth learns that Mr. Darcy has recently saved Mr. Bingley from 'the inconveniences of a most imprudent marriage', her reaction is not expressed in the provided excerpts, thus it cannot be determined exactly from these provided texts. However, in the context of Jane Austen's Pride and Prejudice, when Elizabeth eventually learns of Darcy's interference, she initially reacts with anger and disbelief. It would be acknowledged that Austen's characters are complex and exhibit a range of emotions that develop over the course of the novel, but the specific reaction to this situation is not encapsulated in the provided texts.