The Internet, as well as newspapers and magazines, ________ a more and more important

part in our daily life.[      ]

A. have played  

B. are playing

C. is playing  

D. has been played

小明到商店为自己和弟弟各买一套相同的衣服，甲、乙两家商店的每套售价相同，但甲承诺若一次买两套，其中一套按原价而另一套可获得七折优惠，乙承诺若一次买两套，按总价的80%收费，你觉得（　　）

A．甲比乙优惠

B．乙比甲优惠

C．甲、乙收费相同

D．以上都有可能