Which of the Following Statements Best Describes the Effects of Caffeine

Which of the following statements best describes the effects of caffeine on the body?

A) In the brain, caffeine activates receptors for adenosine and blocks the action of adrenaline.
B) Caffeine is only water-soluble, not fat-soluble, so it is less likely to be absorbed into the bloodstream.
C) Caffeine is a diuretic and can cause extreme water loss.
D) Caffeine cannot readily cross the plasma membrane into body cells, so all effects are short-lived.
E) Caffeine is considered a psychoactive drug because it changes brain function.