题目内容：
根据以下材料回答第题：
Why are bosses in the television industry nervous with Zennström and Friis?
A．The two have devastated the music industry by KaZaA.
B．The two may devastate the telecoms industry by Skype.
C．The two have devastated the television industry by Joost.
D．The two may devastate the television industry by Joost.
参考答案：
答案解析：