Which of the following behaviors is not cause for immediate concern for potential workplace violence?

a. George has been isolating himself for days from his co-workers and is moody all the time.
b. Lester has had car trouble for the last week and has been complaining about not having enough money to pay for repairs.
c. Alex has been argumentative with a co-worker and has resorted to name-calling and yelling.
d. Dexter became irate at a payroll clerk when she reported that the company received a wage garnishment order from the court to pay for past-due child-support payments.

b