Respuesta :
The sentence that supports the idea that a person's behavior can change is A. "Dear heart alive, how his niece by marriage started!".
A central idea simply means the idea that the author wants the readers to know in a sentence. It's simply the main idea.
It can be seen that the sentence that supports the idea that a person's behavior can change is "Dear heart alive, how his niece by marriage started!". An author can change the behavior of a character to illustrate a particular situation.
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