Answer:
B. Require him to break for fluids, then let him continue
Explanation:
According to my research on labor ethics, I can say that based on the information provided within the question you should require the worker to break for fluids, then let him continue. This can be said because when working at a very physical job the body needs plenty of fluids to stay hydrated, that being said each person knows what they are feeling and what they can or cannot handle, so you should let him continue working if he can.
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