如图，在平行四边形ABCD中，点E在AD上，连接CE并延长与

如图，在平行四边形ABCD中，点E在AD上，连接CE并延长与BA的延长线交于点F，若AE=2ED，CD=3cm，则BF的长为（）

A．5cm

B．6cm

C．8cm

D．9cm

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