The progressive reform of the temperance movement in the early 1900s was prohibition of alcohol.
The Temperance Movement
The movement began to aim for a perfect society with temperance.
The 18th amendment fixed the prohibition on alcohol.
After the passing of the amendment, the sale of alcohol, manufacture, and transport is illegal.
Therefore we can conclude that the temperance movement became successful because of the prohibition of alcohol.
Thus option D is the correct answer.
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