单项选择题

Questions 29 and 30 are based on the following news. At the end of the news item, you will be given 10 seconds to answer the questions.
Now listen to the news.
What is the most effective way to reduce tobacco use

A. Offering services to help people stop smoking.
B. Raising taxes.
C. Warning people about the dangers of tobacco.
D. Enforcing bans on tobacco advertising.