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. What phase of due diligence did Xenon miss before buying the property?

A) Phase I
B) Phase II
C) Both Phase I and II
D) Xenon was not required to do due diligence