An observable decline in cognitive abilities shortly before death is called

A) dementia.
B) terminal drop.
C) thanatological decline.
D) cognitive impairment.

Terminal drop refers to the observed decline in cognitive abilities shortly before death. It is a distinct phenomenon from dementia or cognitive impairment that may occur earlier in life. Thanatological decline is a general term referring to the physical, psychological, and social changes that occur during the dying process, which may involve cognitive changes but are not limited to them.