Lena helps a child who is choking on his food. Which reliable method prepared her for helping with this injury?

Safety training classes for babysitting are a reliable way to learn how to respond to choking and other emergencies. Personal instinct, talking with a parent, or watching siblings may offer some guidance, but they do not replace formal safety training. The correct choice is safety training classes for babysitting.

AI-written and checked against the verified answer.