What Does the "Anaconda Strategy" Refer To

What does the "anaconda strategy" refer to?

A) It was the name of the South's strategy to choke northern industry.
B) It was a strategy of passive resistance among slaves to strangle the southern plantation economy from within.
C) It was the name of Britain's strategy to get the two sides to slither to the negotiating table and achieve a lasting peace.
D) It was the initial three-pronged Union strategy that included, among other things, a blockade of the southern coast to strangle the South.
E) It proposed to use biological weapons developed from the poisonous venom of snakes against the South.