Consider the Salary of Mary Sue Nelson,a Sales Agent for Plain

Consider the salary of Mary Sue Nelson,a sales agent for Plain Truth Advertising.Her compensation package for a week is ,where Q is her dollar volume of sales.Her productivity is ,where e denotes her hours of effort and µ is a random variable with mean 0.She has an effort cost of .Under this contract,her choice of effort will be:

A) 0 hours per week.
B) 20 hours per week.
C) 40 hours per week.
D) 80 hours per week.