Answer:
The appropriate course of action if a baby swallows a Lego would be to tell the parents or guardians immediately. Option C is the correct answer. Swallowing a Lego can be dangerous and it is important to seek medical attention right away. The parents or guardians can take the necessary steps to ensure the baby's safety, such as monitoring the baby for any signs of discomfort or distress, or taking them to a doctor or hospital for evaluation. Keeping it a secret (option B) or attempting to remove the Lego themselves (option A) may not be the best course of action and could potentially lead to more harm. Screaming (option D) is also not helpful and may cause unnecessary panic. It is important to stay calm and take appropriate action to ensure the safety and well-being of the baby.