Based on the Assumptions of Traditional Economic Theory

Based on the assumptions of traditional economic theory,

A) we conclude that it is not possible to derive demand curves for consumers or cost curves for producers.
B) we construct a theory of consumer and producer behavior described by demand and cost curves, which assume that consumers and producers make decisions based on all available information.
C) we build theories that work, even when we assume a lack of perfect knowledge on the part of consumers and producers.
D) we build demand and cost curves that may behave in unpredictable ways, because we can't assume that consumers and producers make decisions based on all available information.