The set of properties that are responsible for the volcanic rock to float on water are (c) high porosity, low permeability
This refers to the internal friction of a fluid that allows objects to stay afloat on it depending on the force per unit area.
Hence, we can see that from the complete question, there is the image of pumice which is on a beach in Italy and the main reason why it was allowed to float on the water was because of its high porosity and low permeability
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