Final answer:
The question is looking for a line of dialogue to support an earlier answer about a literary piece. A strong supporting line will directly address and reveal information about the topic or characters being discussed, such as the clear exchange on the character's engagement in the provided dialogue.
Step-by-step explanation:
The given question seems to be concerning the identification of a line of dialogue that substantiates a previous answer (Part A), which isn’t provided. However, even without the context of Part A, generally, the best line of dialogue to support an answer about a character’s behavior or the flow of events in a narrative would be one that is directly relevant to the point being discussed.
For example, looking at the provided dialogue:
“How can I help it?” he asked.
“I should think you would say something.”
“I do say something;” and he paused a moment. “I say that your mother tells me that she believes you are engaged.”
“Well, she does,” said Daisy very simply.
The exchange between the characters directly addresses a topic (engagement) and reveals the characters' perspectives, making it good evidence for supporting an answer that addresses character relationships or events within the story.