Answer:
D. Better weapons and technology .
Explanation:
The American Army always enjoyed technological superiority and superior fire power over the communist forces. The US had air and naval superiority, and also in conventional power.
But the North Vietnamese had great manpower reserves and an iron determination to fight what they saw as a foreign occupier as long as it was necessary with persistent and intrepid guerrilla tactics, an asymmetric response to a stronger adversary. History provides many examples of the Vietnamese people´s fight against outside intruders in protracted guerrilla wars until the enemy wears down: the Chinese, the Mongols, the French and the Americans.
Let's take a look at some command economies: today: North Korea
In the past: The Soviet Union.
We can see that in both cases the countries failed to provide enough food and supplies for their citizens, so one way that command economies influence the citizens of the countries that had them was by inducing hunger. (the same is not true of mixed economies, or not always true).
What is your question? if your asking if it is true than yes it is true
