单选题 Direct advertising ______.

A、 includes all forms of sales appeals to the prospective buyer
B、 is produced mainly for newspaper or television
C、 is an activity by which real products are shown to buyers
D、 uses post as a chief means to contact prospective buyers

【正确答案】 C

【答案解析】根据全文中数处介绍文字可以得出正确答案为C。