A nurse is reinforcing teaching with a client about reducing dietary caffeine intake. The nurse should remind the client that 240 mL (8 oz) of which of the following beverages contains the least amount of caffeine?

A. "Cola soft drink." A standard 240 mL (8 oz) serving of cola contains approximately 20 to 40 mg of caffeine. While this is lower than the caffeine content in coffee or tea, it is still higher than that of hot cocoa. B. "Hot cocoa." Hot cocoa contains the least amount of caffeine, typically around 5 mg per 240 mL (8 oz). Cocoa naturally contains small amounts of caffeine, but it is significantly lower than in coffee, tea, or soda. C. "Brewed green tea." A 240 mL (8 oz) serving of brewed green tea contains approximately 30 to 50 mg of caffeine. While green tea has less caffeine than coffee, it still has more than hot cocoa. D. "Instant coffee." Instant coffee has one of the highest caffeine contents per 240 mL (8 oz), ranging from 60 to 80 mg. This makes it a less suitable choice for someone trying to reduce caffeine intake.