I believe the answer for the first one is B.
A blockade is sealing off a place usually to stop goods from entering an area.
Total war means that any weapons can be used and there are no rules.
I don't think terminal war is a real term, so we can rule this out as well.
Slash-and-burn is used in agriculture to burn down or cut down all vegetation in a land so it can be used for farming.
Ulysses S. Grant's assault resulted in a nine month siege on the railroad center of Petersburg.