【单选题】

{{I}} Questions 6 and 7 are based on the following news.At the end o f the news item, you will be given 10 seconds to answer each of the two questions. Now listen to the news.{{/I}} The staff who work in public places would favor the ban because ______.

A、they don’t have to inhale foul air.
B．they don’t have to serve smokers.
C．they will get more tip from non smokers.
D．there will be a rise on their salaries.