The correct answer is: A. The father warned his son, “Beware of him!”
The other options are incorrect because they do not convey the same level of urgency or danger as the first option. Option B, “Watch that chap!”, is a more general warning that could be applied to any situation. Option C, “Be careful about him”, is also a more general warning, and it does not specifically mention that the son should be wary of the man. Option
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