What was one long-term effect of the work of the Civilian Conservation Corps?

AMany workers went on to become important natural scientists.
BNew forests and improved lands flourished around the nation.
CHundreds of miles of new highways crisscrossed the country.
DPublic buildings and infrastructure helped rural areas grow.

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the Civilian Conservation Corps is responsable for the reflorestation of a great part of the US, so, the biggest long-term effect are the new florests, letter b)

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I believe the answer is: b. New forests and improved lands flourished around the nation.

Civilian conservation corps were a part of establishment that created during the new deal era in order to provide the citizens with jobs in government-funded projects. The jobs created by the civilian conservation crops are related to the maintenance of the environment such as park upgrade, taking care of land reservation, maintenance of natural resource, etc.