What Is the Difference Between an Adaptive Fear and a Maladaptive

What is the difference between an adaptive fear and a maladaptive anxiety response?

A) A maladaptive anxiety response is reasonable in relationship to the perceived threat whereas an adaptive fear is not reasonable
B) An adaptive fear response is reasonable in relationship to the circumstances whereas the concerns would be unrealistic for a maladaptive anxiety response
C) A maladaptive anxiety response is in proportion for the situation whereas an adaptive fear response is out of proportion
D) An adaptive fear response intensifies when the threat is over whereas a maladaptive anxiety response remains the same when the threat is over