Answer: B. Inform the manager that money was taken from the cash register
Step-by-step explanation:
Ethics simply has to do with knowing what's good and what's bad. Since Susan noticed that her co-worker took the extra money without reporting, the ethical thing to do is to report to the manager.
Pretending not to see what happened, splitting the money with her or telling another co-worker about it but telling the co-worker not to tell anyone are all wrong and not ideal. The co-worker who stole should be reported to the manager.