A、Business people. B、Journalists. C、Sport fans. D、Celebrities. C短文提到，几年前Foster办了两份杂志，其中Action是为体育爱好者而办的，故选C。

Mr. Foster started his publishing business with only one magazine. It was called World News. Mostly it had summaries of important week events from around the world. But it always included one or two stories about interesting people. Mr. Foster put these in because he believed all people like to read about other people. Several years ago, Mr. Foster started two magazines. One was called Enterprise. It is for business people. And the other was called Action, for sports fans. Like World News, they always have two or three stories about interesting people. Five years ago, Mr. Foster got another idea for a magazine. He wanted this one to have even more stories about people than the others and to have more photographs. This one was named Faces and Places. From the very beginning, it was a big success.
19. What is Mr. Foster’s profession?
20. Why did Mr. Foster add stories about interesting people to the magazine World News?
21. Who would be interested in the magazine Action, according to the passage?