Which of the Following Statements Regarding Pharmacokinetics and the Aging

Which of the following statements regarding pharmacokinetics and the aging process is TRUE?

A) Aging causes the kidneys to filter out more waste products, enhancing the absorption of many medications.
B) Functional changes in the kidneys, liver, and gastrointestinal system slow the absorption and elimination of many medications.
C) Cardiac cells become more sensitive to medication as they age, meaning that lower doses of cardiac medications are necessary.
D) The GI tract of an elderly patient quickly processes medications, meaning that medications have a shorter half-life than in younger patients.