题目内容：
What is the author's purpose of writing this passage?
A．To promote understanding between vendors and constumers. B．To argue that the Internet generation still cares about their privacy.
C．To persuade people not to constantly update their status on Facebook.
D．To urge vendors to be more privacy-friendly to make a greater profit.
参考答案：【答案仅供学习，请勿对照自行用药等】
答案解析：