Barber and Odean's study of men's and women's trading behavior concludes that... xii. a. on average, men hurt their investment results by trading escessively, but b. on average, women hurt their investment results by tring encessively,but c. on average, both men and women hurt their investment resuilts by trading d. on average, both men and women burt their investment results by trading women do not. men do not. excessively, but the effect is stronger for men excessively, but the effect is stronger for womes e. none of the above