Answer:
The sentence from the story "The Ransom of Red Chief" that is an example of the author's use of speech and actions to develop a character is "He put a red-hot boiled potato down my back," explained Bill, "and then mashed it with his foot; and I boxed his ears. Have you got a gun about you, Sam?"
Explanation:
These lines develop Bill's character, we can see through the story that Bill is always following what Samas say that is the best thing to be done, and at the same time we can see his good nature as he becomes closer to the kid they have kidnapped, these lines include both characteristics it shows dialogue and action from that character.