Many European Nations Use the "Precautionary Principle" to Help Regulate

Many European nations use the "precautionary principle" to help regulate potentially toxic chemicals. What does this mean?

A) Chemicals must be proven to be safe before being introduced into the environment.
B) Corporations may be exempt from testing if their costs in doing so are too high.
C) Regulators must demonstrate risk to the public before banning a chemical.
D) Without a strong risk, corporations need not release data about their products.