By the first sentence of Excerpt 3 the author means that______.
A．he is fairly familiar with the cost of advertising
B．everybody knows well that advertising is money consuming
C．advertising costs money like everything else
D．it is worthwhile to spend money on advertising
正确答案：D
作者在Excerpt3中第一句话指出：“把钱花在做广告上是我知道的最好的花钱方式”所以正确答案为D
