Answer:
a. An extinction burst is the complete cessation of the target behavior after the extinction procedure has started is the correct answer.
Step-by-step explanation:
An extinction burst is one's reaction to a stimulus that has already produced positive reinforcements but that don't exist anymore, meaning that if a person is rewarded for his response after the stimulus, the person will continue doing it even if the reward stops. Due to this, letter A is the correct answer.