问题：
[单选题]上海A公司与北京B公司在上海订立了一份书面合同，A公司在合同上签字盖章后交B公司带回北京签字盖章。该合同成立时间为（）。
A、自A公司与B公司口头协商一致并签订备忘录时成立
B、自A公司在上海签字盖章时成立
C、自B公司在北京签字盖章时成立
D、自B公司签字盖章后，A公司收到时成立
参考答案：
C
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