Respuesta :
Answer: What the author is doing to reveal the character is (D.) describing physical traits.
Explanation: A person's physical traits are the features or characteristics of a person's body. They might make reference to the form of the body, to the tone of the skin, to the length of the hair or to the color of the eyes. In this passage from The Grapes of Wrath, the author presents a character by describing the way he looks, that is to say by describing his physical traits. The author refers to the form of his nose, head and eyeballs and to the color of his cheeks.