The great task that President Lincoln was referring to in his speech shown by this passage is winning the Civil War for the Union.
What did President Lincoln mean?
President Lincoln likened the winning of the Civil War for the Union to be a Great Task.
This was because he knew that it wouldn't be easy but he knew that it still needed to be done in order to preserve the unity of the United States.
In conclusion, option B is correct.
Find out more on President Lincoln at https://brainly.com/question/19537784
