Choice A is the best answer. The passage makes it clear that Lymie finds the party of four who enter the restaurant to be loud and bothersome, as their entrance means he is no longer able to concentrate on his book: "They laughed more than there seemed any occasion for... and their laughter was too loud. But it was the women's voices... which caused Lymie to skim over two whole pages without knowing what was on them" (lines 52-59,"as... back").
Choices B, C, and D are incorrect because (lines 55-59,"cocktail... back") make clear that Lymie is annoyed by the party of four, not that he finds their presence refreshing (choice B), thinks they resemble the people he is reading about (choice C), or thinks they represent glamour and youth (choice D).