Final answer:
The appropriate dose of activated charcoal for a 20-kg child is 25 g (option A). Activated charcoal is used in cases of poisoning or overdose to absorb toxins and prevent them from being absorbed into the body.
Step-by-step explanation:
The appropriate dose of activated charcoal for a 20-kg child is 25 g (option A) Activated charcoal is used in cases of poisoning or overdose to absorb toxins and prevent them from being absorbed into the body. The recommended dose is 1 gram per kilogram of body weight, and in this case, it would be 20 grams (20 kg x 1 g/kg). However, since activated charcoal is usually administered in rounded doses, the closest option to 20 grams would be 25 g.