Final answer:
Elizabeth is frustrated at dinner with Darcy and Bingley due to the societal pressures and her mother's behavior, rather than the food or Darcy's behavior. Option A
Step-by-step explanation:
Elizabeth is frustrated when Darcy and Bingley come to dinner, primarily due to the societal expectations and the uncomfortable situation involving her family, particularly the attentions of Mr. Collins.
The frustration arises not from the dinner itself, nor directly from Darcy's behavior or Lydia's marriage at this juncture, but from the overall context of the evening which includes her mother's behavior and the discomfort it brings.
Elizabeth's discomfort is amplified by the lack of understanding and empathy from her mother towards her and her sisters, highlighting the constrained position of women and the emphasis on marriage as a means to secure their social and financial future as depicted in Jane Austen's novel. Option A