Read the passage.

The fake red lava flowing from the model volcano is the product of a chemical reaction. The chemical reaction is created by combining baking soda and vinegar. Carbon dioxide, which is also present in real volcanic eruptions, is produced when baking soda and vinegar mix. The release of this gas allows the mixture to bubble up like lava in a volcano.

Which key detail is most important for understanding the central idea of the passage?

The fake lava is red like real lava.
Carbon dioxide is present in real volcanic eruptions.
A chemical reaction allows the fake lava to flow from the model volcano.
Carbon dioxide is released when baking soda and vinegar are mixed.