. In the early 1980s. Raoul ran a business that sold stamps for collectors. On occasion, he applied carbon tetrachloride, a hazardous chemical, to stamps in order to reveal watermarks. Raoul closed his business in 1983. He did not know how dangerous carbon tetrachloride could be, so he just dumped the small amount he had left in back of the building his business was in. After he closed his business, Raoul sold the building to Julio, and recently, Julio has sold the business to a developer. The developer tested the soil, and found carbon tetrachloride. The developer is trying to find Raoul, to make him pay for at least part of the clean-up. Is Raoul responsible for any part of the clean-up costs?

a.Yes. CERCLA makes anyone who is potentially responsible for contamination liable for clean-up costs.

b.No. Raoul's activities took place too many years ago.

c.No. There have been other owners of the property since Raoul.

d.Maybe. Raoul may be liable unless there are other parties who did more to contaminate the land.