Riggs Bolt and Machinery, Inc

Riggs Bolt and Machinery, Inc., uses synthetic oils in its production equipment machines. Riggs has discovered that during the 1950s, the used oil was disposed of in a corner of the company's 53-acre campus. Which of the following is true?

A) The issue of the dumping will be covered under the Oil Pollution Act.
B) Riggs is not liable for something that was done prior to existing leaders being in charge.
C) Riggs is liable for the costs of clean-up of the dumped oil.
D) Riggs need not report the oil issue as long as it continues to own the property.