单选题 From the passage, we can safely infer that ______.

A、 the use of video conferencing is still a mystery for the general public
B、 video conferencing may be as simple as telephones for communication
C、 face to face relationship is important for customers and suppliers
D、 video conferencing is especially popular with information technology firms

【正确答案】 B

【答案解析】该题问：根据本文，我们能肯定地推断出什么结论?第三段第三句Video conferences can be point-to-point exactly like a telephone call，…可知选项B正确。