Question: Write a multi-choice question for the following article: Article: News Review APEC Blue People in Beijing got the saying after the APEC meeting in Beijing. It refers to the clear blue sky during the meeting. To get such a blue sky, many factories in Beijing and nearby cities stopped work, and the number of cars on the road was cut. A Warning Ticket A 24-year-old woman in Nanjing was given a warning ticket for eating food on the subway. Eating is not allowed on Nanjing subway. Up to now, 2,698 people have been punished because of their eating, smoking or selling goods on the subway. A Teacher-free Exam Recently, students at Ningbo Huamao Foreign Language School in Zhejiang took their mid-term exam -a teacher-free exam. After handing out the exam papers, the teachers left the classroom, leaving the students to take the exam without being watched. They only came back to collect the papers at the end. A Tomato Fight Do you want a tomato shower? Come to the "tomato fight" in Spain! Once every year, people in the town of Bunol throw tomatoes at each other. Don't worry. It's not a real fight. People do this only for fun.
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Question: A 24-year-old woman in Nanjing was given a warning ticket for _ on the subway.Options:A drinkingB smokingC eating foodD selling goodsAnswer:C