In the presidential campaign of 1912, theodore roosevelt broke from his party and formed a "third" party. what caused roosevelt to take this action?

a) the leaders of the democratic party asked him to run.
b) the democrats would not allow him to seek a third term in office.
c) president taft used his influence to block roosevelt's nomination by republicans.
d) the republicans refused to make any of the progressive reforms that roosevelt had wanted.