The correct answer is B) Abolitionists were only able to reach their goal after many violent conflicts.
The statement that best summarizes the process of the abolition of slavery in the United States is "Abolitionists were only able to reach their goal after many violent conflicts."
After many tensions between the Northern and Southern states, the Civil War began in 1861. Slavery and state rights, as well and the expansion of territories were among the main reasons to go to war. The war ended in 1865 but millions of people died in the battlefields, many towns and properties were destroyed and the Southern states end up with a difficult economic situation. So yes, the statement that best summarizes the process of the abolition of slavery in the United States is "Abolitionists were only able to reach their goal after many violent conflicts."