Which Measure Is Urged by Scientists,who Claim the Global Climate

Multiple Choice

Which measure is urged by scientists,who claim the global climate system is so complex that society will never have the level of certainty wanted by decision makers? 

A)  Take no action until more data are obtained. 
B)  Take action now, based on the precautionary principle. 
C)  Continue monitoring the data. 
D)  Take no action now because global warming is all hyperbole.