A certain company has five departments, A, B, C, D, and E. The number of employees in each department is 10, 10, 20, 30, and 30, respectively. A sample of 10 employees from all employees will be selected. Of the following descriptions of sampling procedures, which is most likely to introduce a potential source of bias?
A.Randomly select 10 employees from department C
B.Randomly select 10 employees from all 100 employees
C.Randomly select 2 employees from each of the five departments
D.Randomly select 1 employee from each of A and B, 2 employees from C, and 3 employees from each of D and E