Answer:
A. Consumers and firms use all available information as they act to achieve their goals
Explanation:
Information is a value, maybe the most important. It´s also scarce and expensive: business pay fortunes to smart men.
And the most worthy information is the one that allows a person to predict the futuro. For instance, who knows what will be the price of oil in one year.
Usually available information is not enough, people cannot acces to a better option, therefore mistakes are made, even throught and after "rational" reasoning. So, people act "rationally", in spite of goal is not always achieved.