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The question asks about the day on which the first of December of the previous year fell. To determine this, we need to count the number of days between the first of December and the present day, January 6th.
From January 1st to January 6th, there are 6 days. We can count backward from Saturday to determine the day that is four days before it, which would be Tuesday.
Therefore, if Saturday falls four days after January 6th, the first of December of the previous year would have fallen on a Tuesday.
Option 1, Tuesday, aligns with this explanation and is the correct answer.
None of the other options align with the calculation or explanation provided. Therefore, we can confidently say that the correct answer is option 1, Tuesday.
Note: If for some reason the provided answer of option 4, Monday, is incorrect, the correct answer should be Tuesday.