Final answer:
Safety training classes for babysitting equip individuals to handle choking incidents effectively.
Explanation:
Safety training classes for babysitting prepared Lena for helping with the situation of a child choking on food. These classes typically cover essential first aid techniques, including how to handle choking incidents in infants and children. While personal instinct and experience like watching younger siblings can be helpful, reliable methods backed by professional training, such as safety courses, equip individuals with the necessary skills to respond effectively in emergencies.
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