The doorway is low, so ___ your head when you go in.

A. mind your head B. watch your head

The suggested answer is A. Do you think B is also correct?
Yes, B is also correct and common.
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Any differences? Can you tell me in what different situations are they used respectively? Thanks!
They are identical in register and intent. 'Mind' + object is used more in some regional Englishes.
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