The passage most strongly suggests that Helga changes to "another, warmer tone" because she wants to get more information from Margaret about Jim Vayle.
In the passage, Helga switches to a warmer tone in order to engage Margaret in conversation about Jim Vayle. This change in tone indicates that Helga is interested in learning more about Jim Vayle and wants Margaret to share information with her. By adopting a warmer tone, Helga creates a more inviting and friendly atmosphere, encouraging Margaret to open up and provide the desired information.
It is important to note that the passage does not explicitly state the exact reason for Helga's change in tone. However, based on the context provided, it can be inferred that Helga's intention is to gather more information about Jim Vayle.
To summarize, Helga's change to a warmer tone suggests that she wants to get more information from Margaret about Jim Vayle.
The Probable complete question could be The passage most strongly suggests that Helga changes to "another, warmer tone" (sentence 27) because she wants to get more information from Margaret about Jim Vayle convince Margaret to have breakfast with her avoid being rude to Margaret stop Margaret from leaving