In What Way Did Truman Change His Behavior Following His

In what way did Truman change his behavior following his rise to the presidency?

A) He relied on the St. Louis Democratic Party machine for policy proposals, foregoing his political independence.
B) He abandoned all the things that had previously defined him and made him successful as a politician.
C) He rehabilitated the poor relationship that he had with the Democratic leaders in Congress.
D) He deferred all policy initiatives to Congress in spite of his dislike of the institution.