参考答案：B

解析：[听力原文] 16-20
With thousands of people traveling every day as a part of their jobs, there is great concern about the effect of jet lag on business travelers. In the world of international business, many men and women have trouble performing their jobs because they feel tired and sick from all their traveling. Businesspeople are not the only professionals who suffer from jet lag. Professional sports players also find that jet lag affects their performance. I have recently read a health report and it looks at the problem of jet lag in professional baseball.
You see, researchers have wondered about how jet lag affects the job performance of people who travel for a living. The problem is that it is very difficult to measure exactly how jet lag affects most travelers, how can we measure the performance of, say, an executive who travels to another country to make a business deal This is where the idea of looking at baseball comes in, so by looking at whether baseball teams win or lose games, researchers believe that we can see how jet lag affects performance in sports, business, and other jobs.
In the study, doctors looked at baseball records from 2001 to 2004. They studied the performance of 19 teams from the Eastern and Pacific time zones, looking at the results of the two games immediately after a team traveled from one coast to the other. The study shows that changing time zones may hurt the performance of West Coast baseball teams traveling east for a game, but not East Coast teams traveling west. The reason, the researchers think, is that people traveling east suffer more from the symptoms of jet lag.
An example of this effect can be seen in the best-of-seven league championship series played in 2003 between the San Francisco Giants and the Atlanta Braves. The games are played in the home cities of each team, so in 2003 the Atlanta Braves and the San Francisco Giants played the first two games in Atlanta, the next three games in San Francisco, and the last two games in Atlanta. In this contest, Atlanta won four of the seven games and was the winner of the series. Researchers believe that the San Francisco Giants lost because they played more games away from home and therefore had more jet lag.
We know from past studies that the symptoms of jet lag are stronger when a person travels east. This is because when we travel east, our day becomes shorter, and a shorter day is more difficult to adjust to. So the players from San Francisco were at a disadvantage when they traveled east for a game in Atlanta. The researchers think that the San Francisco team had more of the symptoms caused by jet lag-problems such as headaches, tiredness, and difficulty thinking clearly. All of these symptoms could result in poor performance by baseball players.
However, this is only the first study to look at the effect of jet lag on sports, and more research is needed. Other scientists say that this research doesn’t prove that jet lag causes poor performance in baseball games. This study only looked at baseball records for three years, and much more information must be studied before we can decide if the losses are truly a result of jet lag and not some other reason.
What about the "home team advantage" Yes, the positive effects of the "home team advantage" are well known. It’s much easier for a team to play a game at home where they can sleep in their own beds and where the local fans can come to the game and cheer for the team. However, jet lag adds to the disadvantage for the team that’s playing away from home. So when the San Francisco team traveled east to play in Atlanta, they were at. a disadvantage in two ways. They were playing away from home and they had strong jet lag from traveling east.

16. How do businesspeople often feel from all their traveling