One of Your Employees Tells You That a Co-Worker May

One of your employees tells you that a co-worker may be routinely leaving early for lunch. The employee states that he is willing to let the unnamed employee-who only recently joined the organization-know casually to stop, but you ask point-blank who the employee is. The employee declines to answer and looks embarrassed. Chances are

A) The employee comes from a culture where such a direct question is rude, especially after the employee offered to help solve the problem without naming the other employee.
B) The employee who approached you is the guilty party and is really gauging what your reaction will be if he's caught.
C) The employee is just looking for attention; why else would he have approached you in the first place?
D) The employee wants you to pay more attention to what's going on in the department.
E) None of the above.