正确答案：
A
解析：
该段录音讲述了Windows系统和微软公司的发展，其中提到比尔·盖茨成为了世界上最富有的人，“His firm has also, of course, been through a bruising battle with antitrust regulators”，可知微软公司经历了与反垄断监管部门的激烈斗争。因此A项为正确答案。
【录音原文】
Windows, just a prototype in 1983, is now the dominant personal-computer (PC) operating system, having seen off a host of rivals. The computer industry has mushroomed in size, gone through several booms and busts, and is now worth around $870 billion. Microsoft has become the world’s largest software firm, and Mr. Gates the world’s richest man. His firm has also, of course, been through a bruising battle with antitrust regulators. But even as the landscape has changed around Mr. Gates, his position as the industry’s figurehead has remained unchallenged. Each year, for two digital decades, he has returned to Comdex to rally the industry, hold court with analysts and journalists, unveil new products and present his optimistic vision of the future.
