According to a Recent Study, What Is the Effect of Cognitive

According to a recent study, what is the effect of cognitive rehabilitation therapy in Alzheimer's patients?

A) Moderately impaired individuals improved in their ability to recall names, but severely impaired individuals showed no signs of improvement.
B) Mildly impaired individuals showed some improvement, but it was fleeting.
C) Mildly impaired individuals experienced improvement in face and name recall and these improvements were maintained after treatment ended.
D) Moderately impaired individuals improved to acting more like mildly impaired individuals, but no changes were seen in severely impaired individuals.