Answer:
The correct answer is C. Reforms led parties to reduce the influence of party bosses by using nominating conventions to choose their candidates.
Step-by-step explanation:
The Reform Era was a period of American history, from the 1900s to the 1920s, during which the nation's political system underwent a radical change, through which the political corporatism prevailing until then was abandoned, to move to a more democratic and transparent. Until then, and mainly at the local level, political machines dominated the nomination of candidates based on nepotism, favoritism or political favors. After the reform, candidate selection systems were created, or they were massified (as in the case of political conventions), thus taking power away from political machines and democratizing the system for selecting public officials.