According to behavioral economics, consumers Part 2 A. do not always behave rationally because they ignore sunk costs. B. always behave rationally because they are overly optimistic about their future behavior. C. always behave rationally because they take into account monetary costs and nonmonetary opportunity costs. D. do not always behave rationally because they take into account nonmonetary opportunity costs. E. do not always behave rationally because they are overly optimistic about their future behavior