Answer:
c. fighting in north America
Explanation:
they knew the land giving them the home field advantage
The answer is the North Vietnamese took over the South Vietnam spreading communism Southward and this proved the domino theory (if one country come under the influence of communism, the surrounding countries would follow).
I'd go with d, Americans were indifferent I had that question on a test so it should be right and if you are having trouble with other courses I'd be obliged to help you.
Hope this helps.
