A is my answer.
A. that for every tax dollar invested into visitors' centers and services, trail maintenance, and wildlife preservation, it returns at least ten dollars to the country's economy that would not otherwise be spent --Correct
B. that for every tax dollar invested into visitors' centers and services, trail maintenance, and wildlife preservation, at least ten dollars are returned to the country's economy that would not otherwise be spent -- at least ten dollars is returned from where
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A. that for every tax dollar invested into visitors' centers and services, trail maintenance, and wildlife preservation, it returns at least ten dollars to the country's economy that would not otherwise be spent --Correct
B. that for every tax dollar invested into visitors' centers and services, trail maintenance, and wildlife preservation, at least ten dollars are returned to the country's economy that would not otherwise be spent -- at least ten dollars is returned from where
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