Which of the following sentences is bias-free？

A.Employees requesting sick leave must file the required paper-work at least two weeks prior to their requested leave.

B.The woman professor is afflicted by heart disease.

C.Some restaurants have a special menu for old people.

D.Every employee is entitled to see his personnel file.

正确答案：Employees requesting sick leave must file the required paper-work at least two weeks prior to their requested leave.