Final answer:
The fifth wheel locking lever not being locked after the jaws close around the kingpin indicates that the coupling is not correct and should be corrected before driving the coupled unit.
Step-by-step explanation:
The correct answer to the question is option C) The coupling is not correct and should be corrected before driving the coupled unit. When the fifth wheel locking lever is not locked after the jaws close around the kingpin, it indicates that the coupling is not properly secured. This can be dangerous and should be corrected before driving the coupled unit.