Which Evidence Is Likely to Form the Basis of an Economist's

Multiple Choice

Which evidence is likely to form the basis of an economist's opinion? 

A)  The human population is growing exponentially. 
B)  Consensus science suggests that potential global climate change, deforestation, and species loss should be taken as serious problems. 
C)  The rate of crop yield increases is declining. 
D)  People are our most important resource.