Final answer:
D) Slavery and the toil of others. The phrase 'wringing their bread from the sweat' in Lincoln's Second Inaugural Address is referencing slavery and the toil of others.
Step-by-step explanation:
The phrase 'wringing their bread from the sweat' in Lincoln's Second Inaugural Address is referencing option D) Slavery and the toil of others. In this context, Lincoln is criticizing the practice of slavery and the unjust exploitation of labor from enslaved individuals to sustain the lives and prosperity of those who benefit from it.