【正确答案】 D

【答案解析】[解析] 本题属细节性问题。我们在文中找到了与此题相关的句子： These ads were strategically placed among family-oriented TV shows and programs involving nature and America in order to most effectively reach target audiences．现在对比四个选项，我们发现只有D选项most travel— lovers and nervous fliers were believed to be among the audiences，和这句话比较符合，因为两者都提到了audience的问题。