Xenon Corporation Discovered That the Soil Beneath Its Headquarters' Parking

Xenon Corporation discovered that the soil beneath its headquarters' parking lot was contaminated with hazardous waste. At the turn of the century, the land had been used by a paint factory. Chemicals in production were probably dumped outside the factory that once stood there. Which of the following is correct in terms of CERCLA liability?

A) Xenon is not liable if it did not know about the factory
B) Xenon is not liable if it can show that intervening uses that were non-toxic did not raise attention to a possible issue
C) Xenon is liable for the cost of clean-up
D) The paint factory owners are not liable because the statute of limitations has expired