What Does the Precautionary Principle Say

What does the precautionary principle say?

A) Industries affected by environmental regulation take precaution against adverse effects of new policies by creating a fund to help meet any potential new requirements imposed by the state
B) Where there is a likelihood of environmental damage, banning an activity should not require full and definitive scientific proof
C) Banning an activity should require full and definitive scientific proof
D) Environmental policy must take caution not to damage the economy