参考答案

正确答案：C
解析：[听力原文]
What do we learn from the woman about the advantage of advertising on TV?
选项提到了expensive，investments，advertising strategy由此推测本题与商务活动有关。本题关键句为“it's just not enough any more.”说明电视广告将会使他们的广告策略更加全面，故正确答案为C)。