Final answer:
Abraham Lincoln, Harriet Beecher Stowe, and Frederick Douglass were all significant voices in America between 1850 and 1890, each contributing in different ways to the country's political and social landscape, making the correct answer D) All of the above.
Step-by-step explanation:
All of the individuals mentioned were significant voices in America during the period of 1850 to 1890. Abraham Lincoln was a central figure in American politics, becoming the 16th President of the United States and leading the country through the Civil War. His views on slavery and his speeches, such as the Gettysburg Address, made a profound impact on the nation. Harriet Beecher Stowe was an influential author whose novel 'Uncle Tom's Cabin' highlighted the horrors of slavery and fueled abolitionist sentiment. Frederick Douglass, born a slave, became a leading abolitionist, author, and orator, advocating for equality and the end of slavery, making him a prominent voice for social reform. Therefore, the correct answer is D) All of the above.