Final answer:
Drysdale claimed they came over to the neighbor's house 'To ask for a favor'. This is reflected in the polite interaction with Mrs. Walker and centers around the etiquette of seeking permission to bring a friend along.
Step-by-step explanation:
Based on the provided excerpts, Drysdale claimed they came over to the neighbor's house "To ask for a favor." This is evident from the reference dialogue where Drysdale expresses a desire to bring a friend along and needs permission for this. Mrs. Walker's amiable response underscores the social courtesy involved in the favor being asked. This interaction highlights the cultural norms of politeness and social interactions that are common themes in literature.