Final answer:
The excerpts from 'Gulliver's Travels' that illustrate description used for characterization are I and III, which describe the character's physical features and distinct voice, making the correct answer C) I and III.
Step-by-step explanation:
The excerpts from Jonathan Swift's Gulliver's Travels that illustrate description used for characterization include both physical descriptions and illustrations of the character's behavior and voice. Specifically, excerpt I "his features are strong and masculine, with an Austrian lip and arched nose . . . ." provides a clear physical description, which is commonly used to help readers visualize a character.
Meanwhile, excerpt III "his voice was shrill, but very clear and articulate, and I could distinctly hear it when I stood up." contributes to the character's image through auditory description. On the other hand, excerpt II "he held his sword drawn in his hand to defend himself, if I should happen to break loose . . . ." while providing some indication of the character's cautious or defensive nature, it is not as distinctly a characterization as the descriptions of physical appearance and voice. Therefore, the correct option in the final answer, illustrating description used for characterization, is C) I and III.