Which statement most clearly illustrates yuchin's vanity in "the bane of the internet"?
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"she wrote: 'i want to let that man see how well i'm doing.' she was referring to her ex-husband."
"sister, i must have a car. yesterday minmin, our little niece, came to town driving a brand-new volkswagen.'
"you don't get it, sister. i cannot drive a chinese model. if i did, people would think i am cheap and laugh at me."
"elder sister, since you refused to me, i decided to act on my own. at any rate, i must have a car. don't be mad at me."

"You don't get it, sister. I cannot drive a Chinese model. If I did, people would think I am cheap and laugh at me."

Explanation:

In the short story, "The Bane of the Internet" by Ha Jin, this statement is written by Yuchin in an e-mail to her sister (who is also the narrator), demanding her to lend Yuchin a sum of $10,000 so that she could buy a foreign car, even if it was doubly rated (as the narrator mentions), because she didn't want to appear "cheap" by getting a Chinese car which was priced less. This sentence shows her excessive concern with her image and status, and hence clearly illustrates her vanity. Her sister realises that Yuchin had also caught the auto mania.

The other options are incorrect because:

mailman is the most possessive answee

either online or traditional classroom can work for students. which is better will depend on students and teacher. students may have trouble following a lesson in classroom while they can study at their own pace online. other students may have trouble staying focus on their own in online classes. teachers are more used to classroom teaching but they may also be more worry about their jobs teaching online classes and work harder.