Final answer:
A geropsychologist is the type of psychologist most interested in memory loss in elderly individuals since they specialize in psychological aspects of aging. Hence, option (c) is correct.
Step-by-step explanation:
Of the listed types of psychologists, a geropsychologist would be most interested in memory loss in elderly individuals. Geropsychologists specialize in the psychological study of aging and the well-being of older adults. They explore issues like memory loss, dementia, and the psychosocial aspects of aging.
In addition to geropsychologists, cognitive psychologists might also be interested in memory loss, as cognitive psychology is a branch that focuses on the study of human thinking and memory. However, if we are considering memory loss specifically in the context of aging, a geropsychologist is the most relevant specialist.