During the war in vietnam, the main opponents of the united states were
south vietnamese civilians.
china and the soviet union.
the south and north vietnamese armies.
the viet cong and the north vietnamese army.

The Viet Cong and the North Vietnamese Army.

Explanation:

The US was an ally of South Vietnam so they were not the enemy.

China and the Soviet Union helped North Vietnam a great deal with logistics, equipment, training but that doesn't mean that they were fighting the US troops.

This leaves only the Viet Cong and North Vietnamese army as the correct answer since the war was against North Vietnam. US lost this war and was a costly and long war of attrition.

it was the Viet Cong and the North Vietnamese Army.

Explanation:

the reson why is that they were the one that were fighting us

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explanation:

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