Final answer:
Political machines and the spoils system led to scandal by rewarding political supporters with government jobs and contracts, contributing to corruption and inefficiency in government.
Step-by-step explanation:
Political machines and the spoils system led to scandal during the late part of the 1800s by rewarding political supporters with government jobs and contracts (D). This system of patronage allowed politicians to distribute government positions to their loyal followers, often based on party loyalty rather than merit. This practice contributed to corruption and inefficiency in government, as individuals who were unqualified for their positions were appointed solely for political reasons. Examples of political machines, such as Tammany Hall in New York, engaged in bribery and favoritism, leading to scandals and undermining the integrity of the political system.