问题：
[单选题]某产品生产4件，经4道工序加工，每道工序单件工时依次为10分钟、5分钟、20分钟、10分钟，在平行移动方式下生产周期为（ ）分钟。
A、105
B、125
C、145
D、180
参考答案：
A
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