The national liberation front was dedicated to

The National Liberation Front was dedicated to unify Vietnam under a communist regime..

Explanation:

The National Liberation Front of South Vietnam, known by American soldiers as Vietcong, was a communist resistance and guerrilla group in South Vietnam during the Vietnam War.  

The American soldiers thought they only had to fight for a few months, but that soon turned into many years. One of the reasons that the Vietcong was able to cope with the Americans is the underground tunnels that were hidden from the Americans. The soil of southern Vietnam was, after all, soft and clayy, so it was easy to dig tunnels in the wet season that remained stable and did not collapse. The best known is the tunnel complex of Củ Chi.

"choosing is refusing" means individuals face an opportunity cost with each decision they make. economists state that every decision involves trade-offs. opportunity cost is the least desirable alternative given up as a result of a decision.

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the correct answer is :

{b.}   ( american workers lose job opportunities )

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