The best and most correct answer among the choices provided by your question is the first choice or letter A.
The conditional statement "If it is January, then it is winter in the United States," is converse of the conditional.
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No. 5 or 6 would be, though.
If it takes eight men ten hours, it would take seven men nine hours, six men eight hours, five men seven hours and that brings us to the answer you need. It would take four men six hours.