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Work on the cleanup of Superfund sites in the state of Michigan has slowed in recent years.
Which is the BEST explanation for this trend?
Most of the hazardous wastes have naturally degraded over time.
Congress allowed the tax on chemical and petroleum production to expire in 1995.
All Superfund sites have undergone remediation and no longer pose a danger.
Congress repealed CERCLA.
A large number of brownfield sites takes priority over the smaller number of Superfund sites.