Demonstration: When making economic decisions, people tend to consider environmental factors less or not, such as cost-benefit analysis of air and water cleanliness, extinction of endangered species, etc. Environmental economists believe that people need to consider environmental factors more It is necessary to give environmental factors a certain economic value. However, the economic value itself comes from the cost-benefit analysis made by people when they make economic decisions. Conclusion: There is a contradiction between the basic research goals of environmental economics and their research methods. Assuming the above argument is correct, how strong does the argument support the conclusion? ['Strong, it is impossible to give a certain economic value to environmental factors, unless people consider environmental factors when making economic decisions.', 'Strong, unless economic decisions have no de facto effect on things affected by environmental factors.', 'Weak at best because the above paragraph does not prove that economic decision makers generally do not consider environmental factors.', 'At best it is weak because the above discussion assumes that pollution and other environmental impacts rarely result from economic decisions.']