Final answer:
The narrator's reaction in the final sentence most likely reflects his feeling that the neighbors' concerns have been adequately addressed, based on the narrative context provided.
Step-by-step explanation:
The most likely motive for the narrator's reaction in the final sentence is that he feels the neighbors' concerns have already been addressed. This conclusion is drawn from the provided context that implies he has been through a process of listening to and possibly addressing queries. Given no indication of impending events or personal questions that the narrator might have, the provided options and the narrative context guide us to this answer.
Examples in the provided passages indicate various individuals dealing with concerns or questions in different scenarios. None of them suggest that the narrator is in a hurry for another event or that the questions posed by the new neighbors are irrelevant. Thus, we can say that the neighbors' concerns have been considered and the reaction of the narrator likely stems from a sense of completion regarding those issues.