Which of These Is an Example of the Contextual Performance

Which of these is an example of the contextual performance dimension known as civic virtue?

A) a cashier who takes on extra responsibilities to help another cashier leave work on time
B) a teacher who continues to work despite a salary reduction and school budget cuts
C) a waiter who encourages his friends to eat at the restaurant where he is employed
D) an engineer who always turns in technical reports on time and who follows safety procedures