How did the tet offensive affect the viet cong during the vietnam war?

it allowed them to enjoy a resounding military victory.
it led to the loss of more than 50,000 of their troops.
it decreased their morale because it led to defeat at the hands of the nva.
it led them to develop new tactics to combat guerrilla warfare.

I checked the answer from these 4 choices:

It allowed them to enjoy a resounding military victory.

(√) It led to the loss of more than 50,000 of their troops.

It decreased their morale because it led to defeat at the hands of the NVA.

It led them to develop new tactics to combat guerrilla warfare.

C.) It left many South Vietnamese towns and cities with extensive damage

Explanation: Those answers are wrong it's C.) It left many South Vietnamese towns and cities with extensive damage

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