The correct answer is the Old Guard and what was to become the "Bull Moose."
Explanation:
This convention was held at the Chicago Coliseum, confronting William H. Taft and Vice President James S. Sherman for reelection. This only meant the beginning of a process of split within the republican toldas, since there was a marked dispute for power that was carried out by William H. Taf and Theodore Roosevelt. Bull Moose was a party that was created after this dispute, where Roosevelt lost the nomination.
