The correct response is: It led to Garfield’s assassination and prompted Arthur to support civil service reform.
The spoils system was a practice where political leaders rewarded their supporters with government positions. President Garfield was assassinated by Charles Guiteau, a disgruntled office seeker who felt entitled to a political appointment. In the aftermath of Garfield's assassination, Chester A. Arthur, who had previously benefited from the spoils system, became an advocate for civil service reform to reduce corruption and prevent such tragedies in the future.