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The correct answer emphasizes the importance of fire safety when using oxygen therapy. Oxygen is a highly flammable substance, and its presence significantly increases the risk of fire. Therefore, it is essential to ensure that any materials or substances that could ignite, such as oils, gasoline, and other flammable items, are kept away from areas where oxygen is being used. This safety measure helps to minimize the risk of an accidental fire, protecting both patients and healthcare staff.

In this context, while limiting the number of visitors might seem relevant for infection control, it does not address the specific risks associated with oxygen therapy. Removing all furniture could lead to a less comfortable environment without directly enhancing safety related to oxygen usage. Additionally, using electrical equipment freely without caution can pose a risk, as some devices can spark and ignite nearby flammable materials, especially in an environment where oxygen is present. Therefore, ensuring that flammable materials are kept away is the primary safety concern when utilizing oxygen therapy.