Generally, according to many people, BC=Before Christ's time on earth. (Christ as in the person that Christian people believe in)
AD=Anno Domini or after his life on earth. Some people would say we are living in AD right now.
The answer is D. diocletian. Hope this helps!
Answer:
Assassination of President Garfield
Explanation:
President Garfield was shot by Charles J. Guiteau at 9:30 am, in Washington, D.C. less than four months into Garfield's term as the 20th President of the United States. Garfield died eleven weeks later on September 19, 1881. His Vice President, Chester A. Arthur, succeeded Garfield as President.
One factor that encouraged president Arthur to pursue the civil service reform was the fact that President Garfield was shot by a crazed office seeker who thought he was owed a government job due to his support for Garfield in the election.
The assassination of James A. Garfield made it possible for the new president and longtime political spoilsman, Chester Arthur, to combat the patronage system's excesses.