[讨论]求助验证难题

1.         Whereas lines of competition are clearly defined in the more established industries, in the Internet industry they are blurred and indistinct, as companies that compete one day may be partners the next. 

1. Whereas lines of competition are clearly defined in the more established industries, in the Internet industry they are blurred and indistinct, as companies that compete

2. Although the lines of competition are clearly defined in industries that are more established, they are blurred and indistinct in the Internet industry, as competing companies

3. The lines of competition are clearly defined in the more established industries, unlike the Internet where they are blurred and indistinct, as companies that compete

4. Unlike more established industries, where the lines of competition are clearly defined, they are burred and indistinct in the Internet industry, as companies that compete

5. Unlike more established industries, with clearly defined lines of competition, those of the Internet industry are blurred and indistinct, as competing companies

GWD答案是A，但是有争议（B）

我也支持A，有两个很关键的原因

1。如果用了the lines（特指more established industries的竞争法则），第二句不能再用they来指代，因为第二句是说因特网行业的竞争法则。

2。one day是副词，必须按照原句的含义修饰compete，否则没有修饰对象

请大家帮助确认一下是不是最后就是这个答案。