The primary danger of performing experiments with flammable materials is "They can catch fire and/or burn rapidly."
While the other options do have their own hazards, they do not specifically address the core issue associated with flammable materials. Here’s a breakdown:
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They can dissolve most organic compounds: This is not specific to flammable materials and doesn't address the inherent risks of combustion or fire.
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They release gases that are harmful to living things: Some flammable materials can produce harmful gases when burned, but this is secondary to the immediate risk of fire.
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They can cause exposure to dangerous radiation that can be hazardous to health: This is unrelated to flammable materials, as radiation is a separate concern entirely.
In summary, the most direct danger of flammable materials is their propensity to ignite and cause fires, which can lead to significant hazards in a laboratory or experimental setting.