What was the strategy of the north vietnamese in the vietnam war?

a) a bombing campaign to break enemy morale
b) gradual troop buildup to deny victory to the other side
c) limited war to force negotiations
d) a total war aimed at victory and reunification

I believe the answer you are looking for is b.  Plz mark brainliest if correct.

Explanation:

i would go with the last one

united states reinforcements contributed greatly to three allied victories in france at: cantigny (first major american battle), argonne (the largest in the united states military history, involving 1.2 million american soldiers), and château-thierry (one of the first actions under general pershing).