B
She is one of the women writers who write stories for children.（她是众多为孩子写故事的女作家之一）
who write stories for children
是修饰 women writers
但是
She is the one of the women writers children who writes stories for children （他是众多女作家中为为孩子写故事的一个）
这个句子who writes stories for children ,这个句子是修饰the one的.
这两个句子只有一个the的区别,但是修饰的人却不同.