Final answer:
Arvide's response cannot be determined, but Sarah greets the General with 'Good morning, General,' indicating surprise at his visit. The question doesn't provide enough context to ascertain why the General is in town or who initiated the greetings.
Step-by-step explanation:
The dialogue provided does not indicate Arvide's response to the General's greeting, so we cannot provide a direct answer to that part of the question. However, Sarah's greeting to the General is indicated to be 'Good morning, General' in the excerpt.
According to Sarah's statement, it can be inferred that the General's visit was unexpected as she expresses surprise at the General's presence in town. Finally, the initiating of the morning greetings can be understood from Sarah's line, implying that she greeted first.