Which of the following best describes how the Emancipation Proclamation was both a political and military strategy? A. It strengthened Lincoln's support from Northern abolitionists and also deprived the South of valuable labor.
B. It divided Lincoln's Northern political rivals and also organized African Americans into military units.
C. It allowed Northern slaveholders to keep their slaves, but required all slaves to work for the military during wartime.
D. It extended the overall power of the executive branch but limited the president's role as commander in chief of the military.

A. It strengthened Lincoln's support from Northern abolitionists and also deprived the South of valuable labor.  

explanation:

there are two statements that are incorrect.

1. the marshall plan was a lend lease program. it was an economic plan that europe redevelop itself after wwii.

2. einstein didn't really do anything to further the allied cause in building the bomb. he merely sent a letter to fdr telling him (in 1939) that if the united states entered the war, perhaps it would be wise to build the bomb before germany did. i would say this answer is incorrect, but when america entered the war 2 years later, fdr thought it might be a good idea to take einstein's advice.

the 4th choice is definitely so wrong that is likely the single answer of this question