阅读下面材料, 从每题所给的A、B、C、D四个选项中选出最佳选项。①Have you ever experienced a quiet carriage(车厢) while traveling by high- speed train in China? According to China State Railway Group, some high- speed trainlines, including the Beijing- Shanghai, Beijing- Guangzhou, and Chengdu- Chongqing lines, have introduced quiet carriage services. The service is popular among travelers and has become a hot topic on Weibo.
② Passengersareabletochoosequietcarriageswhenbookingtrainticketson12306. cn—the official train ticket booking system website. On the 12306 App, trains with quiet carriages will have a Chinese character"静" to remind passengers. If you want to buy a second- class ticket with quiet carriages, you can choose" Please first allocate(分配) a quiet carriage seat for me."
③Upon booking, a friendly reminder will pop up. Passengers in the quiet carriage are expected to follow these agreements, including using headphones when listening to music, turning mobile phones to silent mode, stepping out of the quiet carriage when making or receiving calls, and making sure children remain well- behaved.
④There are clear signs on the doors and walls of the quiet carriages. These remind everyone to keep silent. To further create a quiet environment, the voice announcements(通知) in the quiet carriage are lowered to 30% to 40% of the normal volume(音量).
⑤What's more, the staff on the train remind each passenger of the arrival information one- on- one. They also provide gentle reminders to the passengers, reminding them to keep a quiet environment within the quiet carriage. The meal service staff will also refrain from introducing products and services within the carriages. If passengers want to order food, they can conveniently scan(扫描) the QR code on the armrest of their seat, then the staff will quickly pick up the order and bring the food to them. The train also provides passengers with eye masks and earphones.