Final answer:
The appropriate dose of activated charcoal for a 20-kg child is generally 1-2 grams per kilogram of body weight. Therefore, the correct option would be 40 grams.
Step-by-step explanation:
The appropriate dose of activated charcoal for a 20-kg child is generally 1-2 grams per kilogram of body weight. Therefore, the correct option would be 40 grams (2 grams x 20 kg). Activated charcoal is commonly used in emergency medicine to treat certain types of poisoning or drug overdose.