To prevent a grease fire from spreading, the correct actions would be:
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Use a cover: If it's safe to do so, carefully place a metal lid or pan over the fire to smother it. This cuts off the oxygen supply and can help extinguish the flames.
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Use baking soda: If the fire is small, sprinkling baking soda can help extinguish it since it releases carbon dioxide when heated, which can suffocate the flames.
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Avoid using water: Water should never be used on grease fires, as it can cause the fire to spread explosively.
Given these options, the most appropriate responses are A and B (using a cover and using baking soda). Therefore, "A and B" would be the correct choice.