Theodore Roosevelt posed a threat to the Republican Party primarily because he

A.

was not a member of the Republican political machine.

B.

presented ideas that challenged existing power structures.

C.

was determined to increase profits and power for the wealthy.

D.

supported and assisted trusts not associated with the Republican Party.

Answer: Presented ideas that challenged existing power structures.

Explanation:

In domestic politics, Roosevelt worked to suppress the monopolies and power of capitalist oligarchs. He dealt with this occurrence in the United States railways, as well as with the monopolistic policy pursued by Standard Oil.

These economic giants had a strong influence on the American public as well as the political elite. In these circumstances, Roosevelt comes into conflict with members of his own Republican Party.