Which of the Following Is a True Statement About Dehydration

Which of the following is a true statement about dehydration in an older person?

A) Urine flow gradually decreases in an older person.
B) Older persons generally need less fluid than younger people, because of their lower body water content.
C) Urine specific gravity and skin turgor can be used to diagnose dehydration in older persons and in younger people.
D) Multiple physiological changes of aging place older persons at greater risk of dehydration than middle-aged persons or children.