Final answer:
Amoxicillin is a medication that can be given to a child who cannot be treated with tetracycline.
Step-by-step explanation:
Amoxicillin is a medication that can be given to a child who cannot be treated with tetracycline. Amoxicillin is a type of penicillin antibiotic that is effective against a wide range of bacterial infections. It is often used as an alternative to tetracycline when tetracycline cannot be used due to allergies or drug resistance. Therefore, amoxicillin is the correct choice from the options given.