Which Statement Best Describes Normal Changes of Aging

Which statement best describes normal changes of aging?

A) All age-related changes are the result of disease.
B) When comparing functional abilities of an elderly client,it is important to not allow social or cultural influences to cloud your assessment.
C) It is always very easy to tell the difference between normal aging and the results of one's lifelong poor habits.
D) Individual variations are enormous at every age and in every part of the body.