Which of the Following Is False Regarding Defenses to Liability

Which of the following is false regarding defenses to liability under CERCLA?

A) A defense to liability is that the release of hazardous substances was caused solely by an act of God,such as an earthquake.
B) A defense to liability is that the release of hazardous substances was caused solely by an act of war.
C) A defense exists for purchasers of brownfields,contaminated sites that are eligible for cleaning and reclaiming with assistance from the Superfund.
D) A defense exists if the defendant is less than 50 percent at fault for the contamination.