Behavioral finance argues that O a. the failure to uncover successful trading rules or traders cannot be taken as proof of market efficiency O b. All of these are correct O c. even if security prices are wrong it may be difficult to exploit them, and the failure to uncover successful trading rules or traders cannot be taken as proof of market efficiency O d. d. even if security prices are wrong it may be difficult to exploit them e. investors are rational The most important lesson investors can learn from behavioral finance is how to avoid letting their cognitive biases affect their investment decisions. . a. True O b. False The role of behavioral finance is to help market analysts and investors understand price movements in the absence of any intrinsic changes on the part of companies or sectors. O a. True O b. False