Final answer:
The 'lucky recollection' that Elizabeth has is not described in the provided text but in Jane Austen's novel, it is her realization of Darcy's true character during her visit to Pemberley. The correct option is A.
Step-by-step explanation:
The "lucky recollection" Elizabeth has that saves her from regretting her decision not to marry Mr. Darcy is not explicitly stated in the text provided. However, when considering Jane Austen's novel Pride and Prejudice, the moment of reflection typically occurs when Elizabeth visits Pemberley, Darcy's estate.
There, she witnesses the evidence of Darcy’s good character and hears positive accounts of him, which softens her opinion and causes her to reconsider her prejudices against him. This potentially alters her views but the exact recollection that triggers this change is not outlined in the excerpts given.