After Studying the "Summary of the Effect of Variables on Salesperson

After studying the "Summary of the effect of variables on salesperson performance" many sales managers find

A) Demographic variables are consistently the most important factors
B) Responsibility among salespeople overcomes weaknesses in other areas
C) Some traits commonly used to evaluate new recruits have not proven effective in accounting for differences in sales performance
D) Sociability and self-esteem are negative variables taking away from sales performance
E) All of the above