One Drawback to Having the Salespeople Pay Their Own Expenses

One drawback to having the salespeople pay their own expenses is that this plan:

A) Is complex and expensive to administer.
B) Cannot be used when the sales force is paid a straight commission.
C) Results in management's losing considerable control over the sales reps' activities.
D) Encourages the salespeople to pad their expense accounts.
E) None of these is correct.