A nurse is providing teaching to a client who has a new prescription for tetracycline. The nurse should instruct the client to avoid taking which of the following supplements with tetracycline?

A. Calcium carbonate should be avoided with tetracycline as it can bind to the antibiotic and decrease its absorption, reducing its effectiveness. B. Vitamin C does not interact with tetracycline and does not require avoidance. C. Folic acid does not interfere with tetracycline and can be taken. D. Fish oil does not affect the absorption or effectiveness of tetracycline.