The correct answer is A) supporting labor unions.
The area in which Taft was less progressive than Roosevelt was in supporting labor unions.
As the 27th President of the United States had many goods things and bad things. He had a different relationship with labor unions compared to Roosevelt, but one of the things he was known for, was that he ended with the monopolistic domination of trusts, such as the Standard Oil Company, the property of Jhon D. Rockefeller. President Truman established anti.trust legislation.