The Precautionary Principle States That

The precautionary principle states that:

A) once a theory is developed, it is not sound science to change this theory.
B) human subjects must be used only when no harm is done to them.
C) it is best to act in the face of uncertainty when there is a chance that serious consequences might occur.
D) the Montréal Protocol is mandated by the United Nations because ozone depletion is such a serious problem.
E) None of these answers is correct.