Final answer:
Teddy Roosevelt's running as a third party candidate (Bull Moose) in the Election of 1912 divided the vote between Taft and Roosevelt and helped Wilson win the presidency.
Step-by-step explanation:
The effect of Teddy Roosevelt's running as a third party candidate (Bull Moose) in the Election of 1912 was that it divided the vote between Taft and Roosevelt and helped Wilson win the presidency.When Roosevelt decided to run as a third party candidate, it split the Republican vote between Taft and Roosevelt. This division weakened the Republican Party and allowed the Democratic candidate, Woodrow Wilson, to win the presidency.Therefore, option c) It divided the vote between Taft and Roosevelt and helped Wilson win the presidency, best describes the effect of Teddy Roosevelt's running as a third party candidate in the Election of 1912.