All of the following alienated President William Howard Taft from the progressives in his party heading into the 1912 presidential contest EXCEPT:
a. vetoing the Mann-Elkins Act which made union membership legal in the United States.
b. the firing of Gifford Pinchot for raising questions concerning the actions of Secretary of the Interior Richard Ballinger.
c. reversing Theodore Roosevelt’s agreement with J. P. Morgan by filing an anti-trust suit against U. S. Steel in 1911.
d. Taft’s unwillingness to fight against the higher tariff rates established by the Payne-Aldrich Tariff.