9. Behavioral finance argues that: Even if security prices are wrong, it may be difficult to exploit them. The failure to uncover successful trading rules or traders cannot be taken as proof of market efficiency. Investors are rational. 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. All of the above options. a. b. c. d. e. 10 effects can help explain momentum in stock prices. a. Conservatism b. Regret avoidance c. Prospect theory d. Mental accounting. e. Model risk. f. Put call option pricing theory. g. None of the above