Answer:
c.He grows up to become a police officer
Step-by-step explanation:
One of the definitions of Irony is: "a state of affairs or an event that seems deliberately contrary to what one expects and is often amusing as a result".
A thief is a criminal. And a criminal who grows up to become a law enforcer is deliberately contrary to what you would expect, most of the times. Therefore, it is an amusing result and it can be considered ironic.