After Abraham Lincoln was assassinated Andrew Johnson became president. Thus the correct answer is A.
Why was Abraham Lincoln popular?
Abraham Lincoln was a significant leader in keeping the Union together throughout the American Civil War and starting the process that eventually ended slavery in the country.
From 1865 to 1869, Andrew Johnson served as the 17th president of the United States. He took over as president since he was vice president when Abraham Lincoln was assassinated.
Therefore, option A is appropriate.
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