Procedure c would work, but it requires more steps. So the answer can also be "None of the above".
The extra steps are as follows:
- Empty the 3 gallon jug and pour the 2 gallons in the 5 gallon jug into it. Now there is 1 gallon free in the 3 gallon jug.
- Fill the 5 gallon jug. Pour all but 4 gallons into the 3 gallon jug.
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