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The activity that poses the least risk to students while exploring magnets and magnetism is using a horseshoe magnet to lift lightweight objects. This activity involves engaging with a common classroom magnet that is safe to handle and does not involve any small parts or potentially harmful elements.

Utilizing a horseshoe magnet allows children to experience the fundamental properties of magnetism in a controlled and straightforward manner. Since the objects being lifted are lightweight, there’s minimal risk of injury or harm during the activity, making it a safe hands-on exploration of magnetism.

In contrast, the other options may present higher risks. Exploring magnetic attraction with bar magnets could lead to pinching if students snap the magnets together. Using large letter magnets for creative displays might involve manipulation that could inadvertently lead to the loss of smaller pieces or create messes. Creating shapes with magnetic beads often includes smaller parts that pose a choking hazard, particularly for younger students. Thus, the safest option remains the use of a horseshoe magnet with lightweight objects, ensuring an engaging and secure learning experience.