Teenagers favor e-cards over traditional cards because ______. A) it's easy to keep them C) they are as cheap as paper cards B) it's not difficult to get them D) they are as traditional as paper cards
选项：

A:Teenagers favor e-cards over traditional cards because ______.
B:it's easy to keep them
C:it's not difficult to get them
D:they are as cheap as paper cards
E:they are as traditional as paper cards