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B is corrent. Under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) which is often also known as the Superfund legislation, many parties can be found liable for the cleanup costs of contaminated land. The parties would typically not include minority stockholders of a public corporation that owned the land because shareholders would usually be able to protect themselves due to the corporate veil.
A is incorrect because managers and operators both current and past of the site can also be held liable.
C is incorrect because past owners of the land can also be held liable.
D is incorrect because current owners of the contaminated land can be held liable.