Classified advertising is different from display advertising because ______. What does the writer say about the classified adve

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问题 Classified advertising is different from display advertising because ______.
What does the writer say about the classified advertisements that used to be put in the papers?

选项 A、They used to be voluntary.
B、They used to use display type.
C、They were all of the same size.
D、They were more formal.