Final answer:
Zitkala-Ša ends her passage with the strongest argument to leave a lasting, vivid image of her mistreatment with the reader, making the overall argument more impactful.
Step-by-step explanation:
The student asks why Zitkala-Ša presents her strongest argument at the end of the passage in her work "The School Days of an Indian Girl." The technique used by Zitkala-Ša to present her strongest argument at the end is often employed to leave a lasting impression on the reader. By concluding with the most powerful point of her argument, Zitkala-Ša aims to evoke emotions and create a memorable impact, ensuring that the reader fully comprehends the gravity of her experiences and the extent of her mistreatment. This aligns with choice D of the options, as it serves to etch a vivid image of her terrible mistreatment in the reader's mind, thus strengthening the overall argument and emotional appeal of the passage.