Final answer:
Ulysses S Grant became the President of the United States as a result of Abraham Lincoln's assassination.
Step-by-step explanation:
The correct answer is A. Ulysses S Grant became the President of the United States as a result of Abraham Lincoln's assassination. After Lincoln was assassinated in 1865, Vice President Andrew Johnson assumed the presidency. However, Grant, who was a popular Union General during the Civil War, went on to win the presidential election in 1868.
Learn more about the outcome of Abraham Lincoln's assassination