A) Alzheimer's clients suffer from sudden cognitive losses; clients with vascular dementia suffer from gradual losses.

B) Alzheimer's clients suffer from global cognitive losses; clients with vascular dementia suffer from selective losses.
C) Alzheimer's clients suffer from selective cognitive losses; clients with vascular dementia suffer from global losses.
D) Alzheimer's clients suffer from sudden cognitive losses; clients with vascular dementia suffer from global cognitive losses.

I'll be glad to check your answer.