a. retrograde amnesia.
Explanation:
Retrograde amnesia happens when an individual can't get to recollections of occasions that occurred previously, prior to the hastening damage or sickness that caused the misfortune.
The individuals who are affected are commonly ready to recollect implications and other genuine data however are not ready to review explicit occasions or circumstances. With retrograde amnesia, memory misfortune normally includes certainties instead of aptitudes.
For instance, somebody may forget whether they claim a vehicle, what type it is, and when they got it - yet they will know how to drive.